Unfortunately, this is standard risk and antifraud, not even just Greyball; many many services I know of outright blacklist/block prepaid carriers, prepaid or r

Unfortunately, this is standard risk and antifraud, not even just Greyball; many many services I know of outright blacklist/block prepaid carriers, prepaid or reloadable debit cards, etc. Several places I know of also outright block specific banks and BINs for abuse.