Full KYC will be the one of the main reason for a crypto-gambling site, especially for new ones, to crash early on their business. Should just be asked only if there are suspicious withdrawal or those who hit the site's alarm system.
I won't be passing any form of my identity if it is not required to my work.
For gambling purposes, I prefer to be as much private as I could and as the company offer.
I don't have a lot of money but it's still safer to be just anonymous in the cyberspace specially if it includes money and assets.
That's what others gamblers are probably thinking too, so it's such a bad idea to implement KYC on this kind of platform.
Maybe for minority, requiring is fine, but for majority(as I assume) aren't into this.