You can already deploy free/libre software to proprietary clouds, so that is not a blocker. What is missing is legislation preferring free/libre solutions to proprietary ones, and building up domestic workforce who can directly support them, rather than buying licenses for support of software downstream of open source projects from US vendors.
Cina does it, fat chance of EU being able to do a damn thing though. Particularly tiny, permanently subsidized demographically challenged countries like Estonia.