I use the most popular crypto Bitcoin. I have tried Ethereum, and Litecoin, which are also some common options at online casinos. And have attempted using altcoins like Doge, Tether, and Solana. When compared to using fiat for gambling I have noticed that most online casinos have welcome bonuses specifically for crypto.
In addition, cashing out with crypto is simple too. Typically, withdrawals with crypto are typically faster than other banking methods. Once I receive my winnings, I easily can exchange my crypto on the market for my local currency without no hassle and I can do it at night or during the weekend.
I don't think this is the case nowadays. Because most of the web3 based casinos are now considered also as a project. Their business idea had a timeline or a roadmap. With that casinos introduces their own coin. Now it is not only they're profiting from their business but also from the appreciating value of the coin.
So when entering their website, you can't play with the raw coin BTC or LTC, you have to convert it first as a token.
Web 3 casino in particular, you are very right, but then, this is particularly for complete decentralized casino, you and I know that, there are several casino claiming to be web 3 whereas if properly investigated, they are still the same as normal centralized casinos, the only difference is that, they offer or provide users the ability to login by connecting the casino account to their wallet, casino like this still have the ability to accept coins like bitcoin and litecoin for gambling.
But for casinos that are truly decentralized, I don't think it's possible for them to accept the real bitcoin, user can only use the wrapped version of bitcoin or any other coin that is not a token built and running on the blockchain the casino is built on.