There may still be casinos that don't ask their users to do KYC if they don't withdraw big winnings and allow them to do so. And I think so far, the casinos are not very strict in implementing KYC to their users. Maybe they'll ask random users for KYC or maybe because they suspect an account is suspected of cheating or something.
But if the user doesn't want to submit any paperwork to the casino, maybe they should be able to find a less KYC-minded casino. But he also has to pay attention to how much money he uses to play gambling.
On a normal day the casino will not require for KYC unless you want to make a withdrawal, this is when they comes in to show to show you all they've got in restraining you from making a further steps towards withdrawal unless you completed their regular KYC protocols, but most gamblers feels bad this time because they feels it will be a delay in time for them to achieve what they wanted to do with their money on the casino wallet, and just as you've advised that it's better to go for a no KYC casino and be free than making unnecessary complaints that may never be attended to unless you go strict by their KYC protocols.