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I'm pretty sure most casinos stated they require a KYC and any related verification requirements within their site. When the user signs up, they must accept the terms of service or terms and conditions. Any related information regarding KYC must be stated over there, so they did not necessarily need to state it clearly because it has already been stated on the terms. The problem is most users are ignorant or do not even bother to look over the documents that they agreed/accepted upon.
The first thing a gambler should do is to read through the terms and conditions of the casino and also be able to understand them at all times, be for you even make an account on such a casino, and this is what most casino users don't understand, some of them just go ahead with account creation even though they have not properly read and understand the terms and conditions of the service and how the level of their KYC have been.
Before accepting the term of service of the casino we must first of all be willing to hand out our documents for verifications because this is the most important stage that always gets gamblers stock at some point if they don't understand what really is happening.
It has been a general habit that most users don't do actually read TnC or ToS even though they agreed when signing up. We can't do much and I myself sometimes fall into that scenario.
Nevertheless, concerning gambling sites where identity verification sometimes is a questionable condition, it should be necessary for users to, at least, skim the terms. Users can easily use the feature find in the page to search the word like "KYC", "identity", "AML", and any related words. That alone should give a basic sense of whether KYC is a prerequisite in some particular site.
It's similar to jaywalking, it's the same law everywhere but not enforced in some places. KYC has the same rules everywhere, some casinos don't enforce. Play at the casinos that don't KYC.
That is good and straightforward advice that many gamblers sometimes don't practice. They can choose and decide on which places they play. especially if KYC is their concern.