if you look at the many cases gamblers will usually be asked to complete KYC if they are caught cheating as happened many novice accounts on this forum who complained that their accounts and money were frozen because they did not complete their KYC, usually cases like that I encountered, after all still there are big casinos that without the need for KYC can withdraw money without any problems. actually casinos that use this KYC system also not only prevent money laundering but also prevent fraud from fraudulent gamblers
actually related to KYC which is enforced in casinos there are good and many benefits. but sometimes anonymous gamblers don't want to do the KYC.
it's true what you say if a casino asks its customers for KYC, it means the casino suspects suspicious activity such as money laundering or bonus abuse etc. so that the casino has full rights to ask KYC to its customers who feel there is unusual activity.
and basically, if the casino is licensed but not KYC required, it will eventually ask its customers for KYC when there is a problem or a large withdrawal. so for me when I want to bet at a licensed casino, I will do KYC earlier to avoid if there is a problem I won't be asked for KYC again.