Yet most contributions to biggest FOSS projects like Linux, LLVM etc come from US corpos and institutions. Non-US actors may leverage them, but control over those projects is in hand of US actors, even if letters describing the license doesn't state that, because power in real world doesn't reside in license files or even commit stats.

Yes, in theory Europe (let's ignore there is no such political entity as Europe, but people pretend there is) could hard-fork them and maintain it, but in practice it won't happen, because if it could, it would already.