Meta has plenty of EU-based assets which are not liquid enough to just pull out in a matter of months. The EU and national governments would also likely have options under insolvency laws and criminal statutes to freeze some of Meta's assets in the EU if the company made an attempt to pull out to avoid some fines. Of course Meta won't. The EU is a valuable market and even if Meta would stop making any profit (they won't), it can't just leave that market to the competition.