FATCA is US based and targets US citizens. Unlike the rest of the world which taxes by residency, the US taxes by citizenship, so you could be a citizen of the US but have not been in the US for 40 years, but guess what - due to FATCA, any money you make in any part of the world in which you live now gets reported to the IRS, who will expect you to pay taxes. If you are not a US citizen, FATCA doesn't apply to you; however, CRS does, in most jurisdictions that have signed up for it.