I know many Stake users don't like Stake enforcing KYC. Using stake for a very long time without KYC and getting a certain rank.
There are not so many casinos these days where you can gamble without KYC requirement, so I think stake users should have expected a time like this to come.
There can be many reasons to stop using a casino, but choosing to stop using a good casino because they implemented something that is now a norm in the world of gambling will not be the best decision.