Well, i think you are wrong, for me, i believe its still possible to build a decentralized casino and still be able to accept Bitcoin deposits and withdrawal even though the decentralized casino is running on a blockchain like Ethereum, Binance smart chain, Polygon, Renec Blockchain, Solana or any other chain, for purposes like this is why WBTC exist in the first place, but just incase the decentralized casino owners want to make it possible for their users to deposit and withdraw the real bitcoin, then they would have to build a separate deposit and withdrawal system specially for bitcoin, this can enable users to deposit and withdraw in real bitcoin, but then, i am not sure this deposit and withdrawal system will be decentralized like it is for the other coins.
You're contradict yourself, I already said it's about the casino with Bitcoin, not the casino with centralized shitcoins.
I already know those kind decentralized casino that enable centralized shitcoins to gamble through non custodial wallet and they still accept Bitcoin, but it must make a deposit, not through the non custodial wallet! owlgames, betfury, etc.
WBTC is a shitcoin, don't mix with BTC.