I thought there were tax treaties, basically you don't pay taxes on the first $100k if you paid into the national tax system of the country you are in. I can imagine FICA taxes though might be difficult. Maybe US social security would deny benefits if you claimed them without any contributions and residence abroad.
The $100k you're referring to is the Foreign Earned Income Exclusion [1]. If you're an American working abroad, you don't need to pay income tax on your first $107,600. The exclusion does not apply to self-employment tax or investment income. That's not even the real problem, though. The problem is that banks don't want to deal with the FATCA compliance issues and just refuse to deal with Americans, period. I've expe…
There is no official guidance to FATCA and its processes, and every country has passed its own FATCA related regulations. Therefore running a FATCA compliant entity in say france requires you to comply with all french laws around fatca. Which also leads to issues with GDPR. This creates a cost of several hundred thousand USD per year just to deal with US clients for most western finance companies, per country they do business in.
Or - simply flatly refuse to offer services to any US citizens and rest easy knowing the IRS isn't going to ruin your life just because a US citizen tried to open an account without even depositing a single cent, but you didn't file your IRS stuff correctly