The only one big no KYC casino is Freebitco.in
Maybe that's why Freebitco.in can survive until now and still get a lot of new users because they don't implement KYC at all.
With classic gambling games, Freebitco.in still attracts many new and old users to feel at home playing there.
Apart from that, Freebitco.in provides many interesting programs and rewards and this is one of the ways used by them to get more users.
And by not asking for KYC, they also get a lot of gamblers who don't want to verify their accounts with KYC.