There'll be a stare down eventually
As above, if a fine is ever levied the provider involved will immediately drop service to whatever bits of the EU it thinks will cause the most reaction. Is the Commission likely to buckle in the face of 30m outraged millennials ? Possibly. Or maybe it'll be just the boost needed by that well known EU-grown social network, er, no, I got nothing.
Also Musk claiming today on the back of this that EU offered him a deal to introduce some level of censorship, which he turned down. Hard to verify that either way of course, as everyone involved is paying for a blue tick.