This is the regular operation of some casinos. Casinos often take advantage of this kyc to cheat gamblers. Because they don't have any problem if you deposit huge amount and they don't have any problem if you lose all that money. But, their problem starts when you win big amount, they will force you to complete kyc. Because they try their best to see if they can somehow walk away without giving that winning fund to the gambler. So you should deposit in a reputable casino, so that even if you complete kyc at least, your personal information will be safe. As a crypto user myself I try to avoid KYC. But unfortunately it is true that many times I am forced to complete kyc despite my reluctance.