It will depend on what problems the gambler has done to have to accept the freezing or blocking of their gambling site account, but on average it is problem of with the faud use of bonuses and cheating in playing when the account is blocked then all the money in the account can be diverted to enter the casino bankroll.
Moreover, if it is the gambler fault in cheating then they must be able to accept even though they losse all the money in the account, filing an appeal and so on will be useless because it is purely the gambler own fault.