What is the attitude of the administration of gambling websites to such sales of accounts? Is this not prohibited by the user agreement or something like that? What are the big benefits of high-level accounts if they are offered to buy?
I don't think some certain people will think about this kind of attitude 
But, they will only think about the probability if they are known to sell their account and get banned from the platform. But, as long as they may not be revealed, who can exactly guess that the account has been sold or not yet?
But I myself will also think twice to buy this kind of account. Because, moreover if the platform requires such KYC, it may be trouble someday when we have trouble and we need our exact data to solve the problem. But in fact, we are not the native owner of the account.
But, if there are no prohibitions stated in their TOS, is this still a problem? I also have no exact idea about this.