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.
Most of the casino TOS has a vague description about requiring KYC which always result to complaints like this when the user win a significant amount. This is sometimes a trick to user because they knew that not all gamblers is reading the TOS and they can use it to possibly block the withdrawals of user that don’t want to risk privacy over the money.
You’re right that gambler should have that kind of mindset when playing in the casino because that’s really what the TOS implying by giving uncertain terms. The only problem was gambler is not aware on it because they ignore the read the TOS. This will fall on
ignorance of the law excuses no one.