he KYC policies of casinos are on their TOS so it is important to read them, however we must be honest if you are gambling in several different casinos then it is not going to be rare that you receive some updates regarding the TOS and it is going to be difficult to read them all, so while in theory a player must always read the TOS before playing at a casino and after every single update, most of the time this is something that is not realistic to do.
I think that reading their at least T&C by screening reading is needed in order to know at least some basic information that we need. We may not need to read the whole because it is too boring with commonly small characters. But at least, we can check for several T&C, by searching based on keywords that we need. They are such as KYC, the requirement for deposit and withdrawal, available coins, and others. keywords
Most gamblers do not read T&C because they just register and start playing gambling. I agree to check T&C to know what is allowed and prohibited to not break any point in their T&C.
Fortunately, many crypto casinos allow members not to do KYC as they know anonymity is something that the crypto gamblers want. We already have many casinos with reputations so we do not have to worry about something bad that can happen to us because they will help if we have a problem.