can you give me some links to save my time researching ?
You can actually just type the title as the keywords and there will be those websites that are going to show as results and you may choose from them to check and see.
Gamblers still prefer to use centralized casinos. What I am thinking of is like using the network like eth and basically, you can connect your metamask or any decentralized wallet and there's no need to sign up to play poker. From what I observed here, people still prefer to use sites that do require sign-ups and using coins such as btc and other alts. I haven't seen a casino running a decentralized poker game to be successful on this part.
I've seen that type of casino that you don't have to register and all you need is a metamask wallet. And as I've said, as they say about decentralized poker, the game itself couldn't be like that as it's needed someone to manage it.