They do this with full knowledge that there is very few people that actually trust these online casinos to handle their private info responsibly.
Unfortunately, this is a risk that people have to put up with when playing online, especially at a crypto casino. No matter how reputable a company is, there is always some probability that they pull this.
I'm glad that someone else is advocating against this practice which is being used consistently by casinos on this board. I see this being validated case by case when there are reports about KYC or about accounts being frozen/locked.
...and this is exactly the idea. As well as this, in the event that you do attempt to do KYC, they won't just ask for a photo or a scan of your identity to prove it these days, they'll make you video yourself, video your with withdrawals to prove source of funds, and virtually humiliate you alongside stripping you of any form of privacy.
Unfortunately, this is true. Until there is a strong enough collective pushing the change, casinos will keep on doing what they've been able to do without consequence for the foreseeable future.