Their responsibilities under FINCEN/FATCA are not prove anything, but just have suspicion or some reason to think you might be a "US Person" (not just US citize

Their responsibilities under FINCEN/FATCA are not prove anything, but just have suspicion or some reason to think you might be a "US Person" (not just US citizen, but US resident, or various other special situations). Of course, the US claims to extra-territorial jurisdiction, and bullying of global financial institutions to enforce their crazy inter-planetary tax system, are totally preposterous. Elon - renounce before blast-off!