Is this right?
What they are just trying to protect is their rules and identity thieves' One person can be in one house using multiple accounts, and if you ask them, they can tell you the story of the account that belongs to my relative, and if you ask them to prove it, such a task won't be hard for them to convince; it's simple to just pretend to be whoever they went to be and pass the KYC verification.
If the rules are made clear, it's better it's obeyed, or the casino should be avoided if the gambler is not comfortable with the policy.