The reason is clear, alot of people using prepaid (vcc/physical) cards to f**k Google. They start campaigns with auto payments, generate debits and go to next account.
Every month google add to blacklist range of BINs. In last time they added Revolut cards to this list or they banned all BINs related to prepaid cards. Very bad situation.
People can talk "you are stupid, I have Google Ads account with Revolut cards". Yes... if you︀ have old account and added this card few months ago Rev card is work until︁ expire.
You can't link to Google Ads new Revolut card. I tested this solution with︂ few Billing Countries/curriences.