Genuinely curious. Not sure how this works as I'm not a bizguy.
If Facebook moved its servers and personnel out of the EU to avoid complying with EU law, I'd fully expect--and support--the EU to (a) punitively taxing EU businesses buying Facebook ads, (b) banning EU businesses from buying said ads, (c) extraditing Facebook executives to the EU and then (d) blocking Facebook in the EU. No jurisdiction reacts kindly to brazen, willful criminality.
Option C would never happen. Option D requires the Chinese firewall, very obviously. It's very aggressively courting fascism, practically begging for it; a return to militant European fascism would be the sole possible outcome over time. It would turn the EU into a walled garden network, which is constantly railed against in regards to Facebook.
No, it does not. China's firewall is designed to keep broad swaths of information away from its citizens. An EU block would be designed to put Facebook, and only Facebook, at a strikingly material disadvantage on the Continent. The former must be comprehensive, the latter narrow.
In any case, we're describing a technical solution to a legal problem. If someone believes European courts could not get their pound of flesh from Facebook, that is the definition of arrogance.
This is a red herring. The hypothetical involved Facebook, a company serving European users and with equipment and people in Europe, reacting to European regulation by moving said equipment and people out of Europe while continuing to serve the same Europeans. That is skipping jurisdiction. Given such a blatant attempt to skip the law, while still doing what the law was designed to prevent, one expects enforcement.
A comparable hypothetical would be an American company reacting to an American law by moving its people and servers to Canada while keeping all its American users and then saying "we're no longer in America, you can't touch us."
Facebook receives billions of advertising revenue from Europe (IIRC some 25% of their global revenue), all that money can be trivially seized by authorities, they just need to file the proper request.
Furthermore, there are international agreements on cooperation against tax evasion; I'm not aware of the details for this process but I assume that they could and would use the USA legal system to enforce collection of legitimate debts.
