https://www.fatf-gafi.org/en/countries/global-network.html

I am sure there are better sources than this, but I am going by what I was told by the bank when I opened an account here in Japan. And maybe it does not only apply to Americans, but I was told at the bank that I had to fill out additional anti-terror related paperwork with US details specifically because of US citizenship.

The exemption only applies to earned income, meaning you cannot apply any of that $125k to stuff like investment returns, dividends, royalties, or rents collected.

There is a system whereby foreign banks are obligated to report accounts held by Americans to the US for “anti terrorism” purposes.

And as a us citizen you are also obligated to report all of your foreign accounts in a FBAR filing each year.