Do you think there are no reputable casinos where KYC is not required?
One of the most important and fundamental features of cryptocurrencies is anonymity. In my opinion, cryptocurrency casinos should not require KYC verification. Of course, if you prefer to undergo verification, please, you can do it anytime and anywhere, but in my opinion, if someone plays cryptocurrencies and does not want to undergo verification, should have such a choice.
And there are reputable casinos which kyc are not mandatory, some will automatically ask you for kyc when you exceed on their given free limit. How does he know that a reputable site will take care of his kyc? Did he try working on that specific field already? Facebook is also reputable but there are reports that Facebook sells the data of its users.
We don't know maybe the same thing are already happening in the background when we submit our kyc on our favorite crypto gambling sites. We have no idea because no one have ever exposed it yet. It's not only about if our kyc is safe or not but it is also about privacy. Some prefers to be anonymous.