I wouldn't count on that, in-order to provide rock solid financial service, you definitely need a reliable cloud provider. There is no true equivalent in EU for a cloud provider like that at the moment
What use is american cloud reliability if it can't be trusted in with sovereignty the first place?
https://www.heise.de/en/news/Sovereign-payment-service-Wero-...
> To live up to its claim of being a sovereign payment service, Wero intends to reduce its dependence on non-European cloud providers in the future.
They haven't even started any migration, rather future topic without any deadline.
Also the article states that
> When EPI first launched Wero, only cloud services from international providers could deliver the performance, security and stability needed to deliver a competitive solution
and that's is still true to this day, like what EU cloud provider is on the same level as AWS?
„EPI is currently working to reduce its dependency on non-European suppliers. The market has evolved significantly in recent years, and we are now building on this progress to drive this transition forward.“