Just to tell the US Fedgov to shove it. Better yet, just hide your assets and ignore them. Not that I’m encouraging anyone to break US laws, just saying what they could do.
Some foreign banks are actually telling their expatriate American citizen customers that their accounts must be closed. The foreign banks cannot reasonably or economically comply with this US law, and do not wish to risk the penalties.
The simplest answer for them is simply to accept no US citizen customers.
The US is notorious around the world for breathtaking hubris and overreach, and this is yet another example.
If a few thousand do it, they will get you. If a few hundred thousand do it, they might get you. If a few million do it, you're doing something right out of Saul Alinsky - overwhelming the system.
Hey, the current POTUS has been using that principle successfully, why can't it work for everyone?