Web 3.0 is definitely goin to create several cores of centralisation, as well as its crypto part. Thats why it happens. Any service introduced to the market tends to monopolize and become uniformed, so web 3.0 casino is just a kind of ad campaign in order to creators to take part in gambling market.
Now many of our colleagues and lovers of cryptocurrencies and fans of talking about the decentralization of the Internet love to talk about how great and free it will be when web3.0 covers the entire planet! And everyone will be happy. However, I also think that this concept has much more advertising and real decentralization, even having been born sometime, at some point it will still be controlled by some specific people or groups of people over time.
This is an inevitable process and no one can stop monopolization.
So web3.0, in my opinion, is also just a cleverly invented publicity stunt for too naive Internet users.
Web 3.0 is already implemented on our browser, while web3 is still under development and testing, there are some apps and site that is using them. You can check decentralized casinos wherein web3 technology is applied if I am not mistaken.
They are actually live and had been around for some time now, the Web3 sites and websites that implement web 3.0. You can check this articles[1][2] of the list of web3 sites that are already available on the internet.
[1] https://alvarotrigo.com/blog/web-3-websites/
[2] https://browsertouse.com/blog/7842/best-web-3-0-websites/