A US hyperscaler's 'sovereign' region gives you operational sovereignty; only an EU-jurisdiction provider gives legal sovereignty — and the CLOUD Act is the reason.
Pick a hyperscaler sovereign region — AWS European Sovereign Cloud, Azure with Bleu, Google with S3NS — when you need the hyperscaler's full service breadth and scale and your requirement is data residency plus EU-resident operations. That buys operational sovereignty, but the US parent stays reachable under the CLOUD Act, so it is not legal sovereignty. Pick an EU-native provider — OVHcloud, Scaleway, IONOS, STACKIT, T-Systems, Aruba — when legal sovereignty is the real requirement: an EU-jurisdiction company with no US parent sits outside the CLOUD Act's reach, at the cost of a narrower catalogue and smaller scale. The deciding question is which sovereignty you actually need — data residency and operational control, where a sovereign region is enough, or immunity from foreign legal compulsion, where you need an EU-parent provider. In a hyperscaler's marketing, 'sovereign' means the first, not the second.
| Criterion | Hyperscaler sovereign region | EU-native provider |
|---|---|---|
| Legal sovereignty — immune to US compulsion? | No — the US parent stays reachable under the CLOUD Act | Yes — EU-jurisdiction parent, outside US reach |
| Operational sovereignty (EU staff + ops) | Yes — EU regions, EU-resident operations | Yes — EU-resident by default |
| Data residency | EU region / data boundary | EU only |
| Service breadth & scale | Full hyperscaler catalogue + global scale | Narrower catalogue, smaller scale |
| Certifications (SecNumCloud / C5 / ENS) | Often via an EU partner (Bleu, S3NS) — verify per service | Several hold SecNumCloud (ANSSI) outright |
| Provider parent jurisdiction | US — sometimes operated via an EU joint venture | EU — company + parent both in-jurisdiction |