It's all about money. If they aren't giving access to new casinos it means it's highly profitable to stick exclusively with the consolidated ones. More profitable than it could ever be if they accepted new casinos onboard. I think it's a pitty it happens this way, because crypto is totally about decentralization and decentralization was supposed to solve the issue with treating businesses and people differently depending their financial status and contacts network. Unfortunatelly the big guys will always be treated with exclusivity in this world. That is the reality, and if you want to be treated like that, you have to fight to be one of the big guys.