Honestly, KYC is not important in gambling site even after register and that's only if something fishy or huge money is not involved. Any gambling site which asks their users for KYC if something fishy is not been notice or the fund won or withdrawing by the player is up to 2BTC is actually abuse the KYC gambling site KYC procedure.
Mind you, windice don't have such situations.
But that's kind of the exact problem with kyc in gambling, that it is enforced AFTER money is deposited. I have no problems with sites that ask right away and upfront. Then at least people like me who never want to do KYC if possible, we can see this and we can go elsewhere. I choose the sites that don't do kyc, so I never have a surprise at the end of the day when they want to kyc my ass on some random suspicion they just made up.