That’s only really feasible for as long as the corporation has a physical presence in the EU and/or the corporation’s home government is willing to enforce the laws of a foreign government upon their own corporations/citizens.

I know Twitter used to have offices In the EU, but I don’t know if that’s still the case currently. If it’s not then without the cooperation of the US government there’s not much the EU can do if Musk decides to tell them to pound sand.

I’m not saying I think he’s in the right, I just don’t see how it’s possible for any nation to enforce laws outside of their own borders without the co-operation of other governments, and I don’t see how the US government could possibly co-operate to enforce foreign laws that would likely violate the US constitution.