29OCT

EC opens DMA cloud probes against AWS and Azure

3 min read

17:49UTC

Brussels extended its gatekeeper enforcement from app stores into cloud infrastructure. Washington called it economic warfare.

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Key takeaway

DMA cloud probes target the switching costs that protect US hyperscalers' 70% European market share.

The European Commission opened cloud gatekeeper probes against Amazon and Microsoft in late 2025, extending Digital Markets Act enforcement to cloud infrastructure for the first time⁠¹. The probes could mandate interoperability standards and data portability requirements, lowering switching costs for European enterprises running workloads on AWS and Azure.

The US administration treated the move as an escalation. A Section 301 investigation (a US trade law authorising retaliatory tariffs) explicitly named DMA cloud rules as "economic warfare"⁠². Washington's response focused on the cloud probes, not the consumer-facing app store fines, a distinction that reveals which enforcement actions the US considers a genuine threat to its companies' market position.

European cloud providers already compete effectively on price. A Callista benchmark from February 2026 found Hetzner delivers 14.3 times the compute value per unit cost compared to AWS; Scaleway delivers 4.8 times the value per euro⁠³. The barrier to European cloud adoption is not cost. It is enterprise inertia, migration complexity, and gaps in managed services. DMA interoperability mandates would address the switching cost problem directly, though the timeline from probe to enforceable remedy is measured in years, not months.

EU-native cloud providers hold approximately 15% of the European cloud market against 70% for AWS, Azure, and Google combined⁠⁴. If the probes result in enforceable interoperability rules, the price advantage European providers already hold could translate into market share gains that pure competition has not delivered.

Deep Analysis

In plain English

Amazon Web Services (AWS) and Microsoft Azure are the two largest cloud computing companies in the world. A cloud company provides the computing power, storage, and software services that businesses use to run their digital operations; everything from email to product websites to banking systems. The European Commission opened formal investigations into both companies in late 2025 under the Digital Markets Act, the same law used to fine Apple and Meta. The allegation is that AWS and Azure make it too difficult and expensive for businesses to switch to a different cloud provider, locking them in through technical complexity and proprietary data formats. The United States responded by opening a formal trade investigation, calling the EU rules 'economic warfare'. This is an escalating diplomatic and legal dispute about whether the EU can regulate how American technology companies operate within Europe; even if those companies are based in the US.

Deep Analysis

Root Causes

The cloud probe's root cause is the CLOUD Act problem: US law gives American intelligence and law enforcement agencies the right to demand data from US companies regardless of where it is stored.

For European enterprises handling sensitive data, this creates a structural incompatibility with EU data protection law. DMA interoperability mandates are partly a workaround: if switching costs are reduced, European enterprises can move to EU-based cloud providers that are not subject to CLOUD Act jurisdiction.

The Hetzner 14.3x and Scaleway 4.8x cost-performance differentials relative to AWS reflect genuine economic inefficiency in the cloud market, driven partly by AWS/Azure margin extraction from captive customers and partly by the genuine premium for AWS's additional services and global reach.

DMA interoperability mandates would make switching to European providers more viable by reducing the migration cost, which is currently estimated at 18-36 months of engineering effort for large enterprise workloads.

What could happen next?

Opportunity
DMA cloud interoperability mandates could structurally reduce AWS/Azure switching costs, potentially shifting 5-15 percentage points of European cloud market share to EU-native providers over a 5-year horizon.
Long term · 0.6
Risk
US Section 301 investigation creates trade retaliation risk; tariffs on EU goods or withdrawal from bilateral digital trade agreements; that could force a political compromise limiting DMA cloud enforcement.
Medium term · 0.65
Precedent
A successful DMA cloud probe outcome establishing interoperability standards would create a replicable regulatory template for cloud market structure globally, potentially triggering similar proceedings in the UK, Japan, and Australia.
Long term · 0.55

Source Landscape

This story draws on mixed-leaning sources from Ireland and United States

Ireland

United States

Primary parallel: The EU's GDPR enforcement against US companies beginning in 2018 followed the same pattern: a regulatory framework that applies to any company processing EU data, regardless of domicile, creating compliance costs for US companies that EU-based competitors either meet through existing design or are structurally exempt from.

The GDPR 'Brussels Effect'; whereby US companies adopted GDPR-equivalent privacy practices globally to simplify compliance; is the model DMA architects are explicitly replicating for cloud infrastructure.

Counter-parallel: The EU's attempt to apply competition law to Microsoft's browser bundling (the Windows/Internet Explorer case, 2004-2009) eventually resulted in a ballot screen remedy that had minimal impact on browser market share. The structural lesson: behavioural remedies in software markets are difficult to design effectively, and interoperability mandates are technically harder to implement than they appear from a regulatory perspective.

The potential €100bn+ fine exposure figure is theoretical: it represents the maximum DMA fine (10% of global annual turnover) applied simultaneously to both AWS (approximately €550bn market cap equivalent revenue) and Azure (Microsoft's cloud segment). In practice, fines would be calibrated to specific conduct and would almost certainly be settled or reduced on appeal.

The commercially significant impact is not the fine but the interoperability mandate. If AWS and Azure must provide standardised APIs for data portability and service migration, the estimated 18-36 month engineering cost of enterprise cloud migration falls significantly; potentially to 3-6 months for structured workloads.

At current European enterprise cloud spend of approximately €80bn annually, even a 10 percentage point shift in market share over five years represents €8bn of annual revenue at stake for European cloud providers.

Consensus view: The Alliance for Digital Infrastructure (ADI) and the European Centre for International Political Economy (ECIPE) both assess the DMA cloud probe as the most significant extension of EU platform regulation to infrastructure: cloud gatekeepers have network effects and switching costs that are structurally similar to consumer platform lock-in, but the economic scale of the affected market ($500bn+ global cloud revenue) is an order of magnitude larger than consumer app markets.

The probe's interoperability mandate, if implemented, would be the most impactful single regulatory action for European cloud sovereignty since GDPR.

Counter-view: The US Chamber of Commerce and the Information Technology Industry Council (ITI) argue the DMA cloud probe is extra-territorial regulation: AWS and Azure infrastructure decisions made in Virginia and Redmond are being subjected to EU behavioural remedies without an equivalent obligation on EU-based cloud providers who face no comparable regulatory burden.

The Section 301 response is legally supported by WTO non-discrimination obligations, making this a genuine international trade dispute rather than pure domestic regulation.

Key tension: Whether the DMA's territorial scope; which applies to services offered in the EU regardless of where the company is headquartered; constitutes legitimate regulatory jurisdiction over foreign companies' global infrastructure decisions, or represents a form of extraterritorial regulation that WTO trade law prohibits.

First Reported In

Update #1 · Europe's chip ambitions meet reality

Irish Times· 13 Apr 2026

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Causes and effects

This Event

EC opens DMA cloud probes against AWS and Azure

Cloud gatekeeper probes could mandate interoperability standards that lower switching costs for European enterprises, directly benefiting EU-native providers like OVHcloud and Hetzner that already win on price but lose on enterprise inertia.

Led to

EU awards first sovereign cloud deal

The sovereign cloud procurement framework provides the Commission a positive instrument to cite against the ongoing DMA cloud probes against AWS and Azure.

Occurred 17 Apr 2026

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Commission awards sovereign cloud slot to Google joint venture

The DMA cloud gatekeeper probes against AWS and Azure that prompted the US Section 301 response created the political context in which the Commission built a sovereign cloud framework including a US-linked provider.

Occurred 17 Apr 2026

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DMA clock starts toward six-day AI Act collision

The EC's broader DMA cloud probe strategy established set the enforcement context in which the Google search-data consultation was opened.

Occurred 16 Apr 2026

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Three EU-US deadlines collide in 9 days

The Section 301 final determination schedule confirmation on 24 July is the direct continuation of the US Section 301 investigation launched in response to DMA cloud probes.

Occurred 7 May 2026

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Brussels readies record Google DMA fine

The DMA cloud gatekeeper probes are the enforcement lineage within which the Google self-preferencing fine and Ribera's blackmail framing sit.

Occurred 25 May 2026

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Different Perspectives

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United Kingdom (CPS and Counter Terrorism Policing)

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Qatar (mediators)

Qatar-led mediators put new terms to Iran this week, which an Iranian official called "ideas, not a proposal". Riyadh framed the Tehran meeting as support for Qatari and Pakistani mediation, keeping Doha at the centre of the indirect channel.

Korea Shipowners' Association

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Written with AI from Lowdown's published reporting. Not individually reviewed by an editor. Editorial standards.