Comment by jeroenhd

Because of the nature of the DSA, Twitter would be failing to comply at a European level. Very worst case scenario (which probably will never happen) all European assets will be seized before they can be transfered back to the parent company to make sure fines will be paid. Some European employees might be caught for fraud and jailed. Obviously Twitter's domains would be blocked across the EU, though a cheap VPN is all you'd need to bypass that.

Musk may put himself in a rather awkward position, as the CEO of a company actively refusing court orders. He may be arrested and prosecuted for his actions, so it'd be unwise for him personally to visit his European offices. I'm sure he has committed some form of crime throughout the past couple of years they can jail him by.

In practice, we'd probably just see a short-lived domain block. Jailing Elon will probably set off Trump and his cronies so the EU will probably not bother to go after him.