the strange thing in my opinion is, many crypto gambling sites currently do not enforce KYC at the time of registration but when WD they do it, it is clear that users are like being deceived by their tricks, I have never used gambling sites that require KYC, there are many sites gambling that does not apply KYC and respects user privacy.
Some people miss the TOS information because they don't pay attention to the KYC rules will be asked at any time, although the regulations on KYC are not specifically explained but each user must prepare KYC documents if the gambling platform will ask you to complete to open withdrawal access, so some users will leave the casino because privacy factor but I'm sure they will verify KYC if they have balance from slot winnings.