If offshore banking lawyers and accountants were able to launder money for a client but werent able to go around fatca, then why couldnt they fake the paperwork to the banks like ubs in switzerland and make it seem the client lives in some third world country instead of the u.s.? Even if they could, how would the u.s. government figure out that such greencard holder is using a physical mailing address in some third world country and using that to bypass fatca? How could a greencard holder bypass fatca then assuming corrupt offshore banking lawyers and accountants were facilitating it then?