First thing to do by certain individual to check if a casino will require KYC or not so that you still have a time to think about if you want to continue to play or not. Saying about you didn't know about implementation is dumb reason because it will not gain anything especially if casino have written rules about this option.
Usually, those who are in a hurry and do not read the rules of using the casino and do not check its reputation lose their money and they lose money more often than those who carefully explore the casino and its rules before starting to play it.
Often only unexperienced players start to play in casino without checking any information and checking the reputation the casino. The more the user play in casino the more it starts to check not to lose more money by playing.