2025

In 2025, the European Union's EuroStack initiative emerged as the most ambitious attempt yet to create a genuine European alternative to US hyperscaler dominance in cloud infrastructure. Building on the European Cloud Alliance's earlier work and the political momentum created by GDPR, Schrems II, and the CLOUD Act conflicts, EuroStack represented a coordinated investment in EU-sovereign cloud infrastructure—compute, networking, AI platforms, and collaboration tools—that could support European organizations without creating US legal jurisdiction exposure.

For data sovereignty officers and European technology buyers, EuroStack is both a policy development to monitor and a practical set of options to evaluate. Understanding what EuroStack is trying to achieve, what progress has been made, and what its limitations are helps organizations make informed decisions about cloud strategy that don't simply default to US hyperscaler assumptions.

The EU Cloud Sovereignty Problem

European cloud infrastructure is dominated by US companies: AWS, Microsoft Azure, and Google Cloud collectively hold the vast majority of EU cloud market share. This dominance creates a structural tension with EU data sovereignty objectives. US cloud providers, regardless of where their data centers are located, are subject to the US CLOUD Act—which permits US law enforcement and intelligence agencies to compel disclosure of data held by US companies, even data stored in EU facilities.

GDPR's adequacy framework, designed to ensure that data transfers to third countries receive equivalent protection, doesn't address the US CLOUD Act problem directly. EU personal data stored in AWS Frankfurt or Microsoft Amsterdam may technically satisfy GDPR data residency requirements while remaining accessible to US government compulsion under CLOUD Act procedures. This gap between legal residency and actual sovereignty is what EU cloud alternatives are designed to address.

Earlier European cloud initiatives had limited success. GAIA-X—launched in 2019 as a federated European cloud project—struggled with governance disputes, unclear value proposition, and the participation of US hyperscalers who were admitted as members while nominally undermining the initiative's sovereignty objectives. The French cloud sovereignty label (SecNumCloud) created a certification framework, but certified providers had limited market penetration relative to US competitors.

EuroStack: Architecture and Ambition

EuroStack's distinguishing feature was its systems architecture approach: rather than attempting to build European alternatives to individual cloud services, EuroStack defined a full technology stack from infrastructure through applications. This included sovereign compute infrastructure (European colocation and dedicated hardware), European-operated cloud platforms, EU-developed or EU-controlled AI models, open-source collaboration tools, and identity and security infrastructure.

The open-source foundation of EuroStack was deliberate. European sovereign cloud alternatives built on open-source components—Linux, OpenStack, Nextcloud, Mattermost, Kubernetes—are not subject to US export controls, intellectual property constraints, or vendor dependency risks that proprietary software creates. The open-source stack is auditable, forkable, and not controlled by any single vendor—properties that sovereign infrastructure requirements demand.

• OVHcloud, Deutsche Telekom's Open Telekom Cloud, and several Nordic providers expanded sovereign cloud offerings with EuroStack-compatible certifications
• Open-source collaboration stacks (Nextcloud + Mattermost + OnlyOffice) gained enterprise traction as EuroStack-aligned alternatives to Microsoft 365 and Google Workspace
• EU AI models—Mistral AI (France), Aleph Alpha (Germany)—provided European AI options that avoided US CLOUD Act exposure for AI inference
• French public sector SecNumCloud adoption accelerated, demonstrating that EU sovereign cloud could achieve production scale
• Procurement frameworks in Germany, France, and Scandinavia began including sovereignty criteria in technology procurement standards

Lessons Learned: Sovereign Cloud Requires Ecosystem, Not Just Infrastructure

The EuroStack experience confirmed that cloud sovereignty is an ecosystem problem, not just an infrastructure problem. Building EU-sovereign compute is necessary but insufficient if the applications, AI models, identity services, and security tools that run on that infrastructure remain US-dependent. EuroStack's full-stack approach—addressing applications and AI alongside infrastructure—was more strategically coherent than single-layer initiatives.

The performance and feature gap between EU sovereign options and US hyperscalers narrowed through 2024-2025 but hadn't closed entirely. Organizations choosing sovereign alternatives accepted some trade-off—typically in feature breadth, ecosystem integration, or performance at extreme scale—in exchange for sovereignty properties. The trade-off calculation depends heavily on the specific compliance requirements and data sensitivity of the organization.

Outpace Professional Services helps European clients evaluate sovereign cloud strategy against their specific compliance requirements, data sensitivity, and operational needs. Not every organization needs full sovereign cloud—the compliance requirements and sensitivity levels vary significantly. But organizations in regulated sectors, government-adjacent roles, or with contractual data handling requirements may find that US hyperscaler alternatives are no longer adequate.

We design hybrid cloud architectures that use EU sovereign infrastructure for the most sensitive workloads while maintaining US hyperscaler integration where sovereignty requirements don't apply. This pragmatic approach captures the sovereignty properties required for compliance while maintaining the operational convenience and ecosystem breadth that makes cloud computing valuable.

The Strategic Direction

EuroStack represents the EU's most coherent response yet to US cloud dominance. Its success depends on investment sustainability, ecosystem development, and adoption momentum—all of which are uncertain in the competitive cloud market. But for European organizations with genuine data sovereignty requirements, EuroStack provides a credible framework for evaluating EU-sovereign alternatives that would have been difficult to assemble from individual components before 2024.

💡 Ready to build your EU sovereign cloud strategy? Outpace Professional Services evaluates your sovereignty requirements, assesses EuroStack-compatible alternatives, and designs hybrid cloud architectures that deliver compliance with sovereignty requirements without sacrificing operational effectiveness.