I'm not sure whether my understanding is correct but, IMO it's like you've done KYC at the casino and all the money you withdrew has been successful but you're only worried about the data you've sent and on the one hand you're worried about betting again at the casino.
as long you really don't like the feature I think everything is fine, you don't need to be too hasty to force the casino to delete your account because you already said that the casino seems to be very new and they have a policy of at least 90 days and that's not it there is a compulsion to place a bet during that time and you just have to ignore it and after that do your usual activities without accessing the site again.

I think this is not too worrying because everything is fine as long as you are not scaming or your money cannot be withdrawn. I think you are fine and it is just a matter of time for you to wait until the specified time limit because casinos have their own rules and you must comply with these rules.