To be clear are you looking for on-chain games right?
Actually, I'm not just interested in on-chain games, although those do fit the description. I'm interested in casinos that allow me to deposit and withdraw using cryptocurrency (such as BTC) without converting it to fiat currency. In other words, I want to be able to keep my entire bankroll in BTC (or other supported cryptocurrencies) while using the casino. Thanks for the recommendations, anyway.
I experienced this on winz.io you can make a deposit with BTC and all your bets are also fixed in BTC units, this casino won't convert them to USD or UER, but I played there last year and maybe around the middle of the year so it's been 6 months more and if I'm not mistaken they have updated the units of betting currencies but don't know the details whether players can choose to stay with crypto units or will it automatically become USD or UER, because I haven't played there in a long time.
Whether the casino is recommended is up to you. If you really don't like KYC then you should think again.