I do not see any good reason for them blocking multiple accounts in casino gambling by the casino platform because it has no negative effect to the platform. As long as those accounts do not go against the rules of the casino platform. They need more users and that is also part of getting new users into the system. The reason for banning multiple account in the Casino platform should be that they either violate the platform rules or cheat other users int he platform.
We'll creating or having two or multiple accounts should not be the reason why gambling sites choose to block accounts but yes sometimes some open multiple accounts to carry on illegal activities so I believe if it's in this perspective they ought to block more than one gambling accounts.
But nevertheless most people violate casinos rules and regulations, some don't even take time to read them to know what they are to do or not, so if such accounts violate the platform rules they shouldn't be exempted for blocking and banning permanently.
This things are occuring more often because they feel they can have their way through things before anyone is going into gambling you should be on the safer sides by reading terms and conditions so you'll not violate this rules.