Can you revoke trust? If the answer is no, what happens when a scam account is discovered? They get to just keep mining new coins forever and passing them to

Can you revoke trust? If the answer is no, what happens when a scam account is discovered? They get to just keep mining new coins forever and passing them to the people unwise enough to trust the account before it was discovered to be fake? If the answer is yes, what happens to the coins already mined by the scammer? Last person holding them loses?