In my own personal experience, KYC was not compulsary until I made larger and larger deposits and withdrawals from the casino. Especially if you do, deposit then withdraw within a short period of time more often. We can't blame the casino if they check on their users to find out if they're merely using the site as a sort of mixer/tumbler. But if the user is an honest person who merely wants to gamble, then just comply and there's nothing to worry about.
KYC is always compulsory to any casino that has a Curacao license. They just require it in random basis but all the account is subjected to KYC at some point of their game. Casino just imposed it during registration process but you automatically agree to undergo KYC once you are asked the moment you sign up and agree the casino ToS.
Do you, or anyone in the forum, know what licenses DO NOT strictly require or enforce KYC on their users? That might be a good tip for those who don't want to give up their privacy, no?

It’s not about how huge your withdrawal but depends on the overall activity of your account since you can be subjected immediately to KYC if you show some shady activity.
OK, ot was probably when I was being more active in my deposits and withdrawals that started to casino to notice. I wasn't doing anything "shady", I merely didn't want to keep me coins in the casino for more than 24 hours. It's not that I don't trust the casino, it's just because we were given a feature of self-custody by Bitcoin.
¯\_(ツ)_/¯