In fairness to TheQuin, indeed "under any circumstances" might simply be an exaggeration. They're hollow words. If worst comes to worst, they might not hold water.
There are still casinos not asking KYC under any circumstances? Really? Which ones are they please? Except few fully decentralized casinos/sportsbooks, I am not aware of that. It must be some tiny ones I guess, no?
If you tell me that the casino owner gets a gun to his head or his children are kidnapped and under threat of torture, then rape and then murder he has to ask for KCY, well surely yes there will be circumstances under which they can ask for KYC, but this is not what we are talking about here.
There are casinos that would not ask for KYC under any circumstances in the same way that there are mixers that would not cooperate with the authorities under any circumstances. Not too long ago we had one on the forum that did not cooperate and was raided for it. In the same way others at the slightest touch of attention from the authorities will collaborate.
As for casinos, not requesting KYC is linked to not having a gaming license, and the list of those that do not do so has been shrinking over the years, but at the moment of those listed in Mahdirakib's thread I have no reason to assume that they will request KYC.
If you are an average user, who does not bet in the casino more than a few hundred a month at most, rest assured that those who do not have a license and have ToS saying they will require KYC will not ask for it.