Many players out there register on platforms for reasons best known to them, and it depends on their interests, which range from bonuses, wager requirements, games, etc., and that is what makes casinos unique in their own way, so you should not be surprised seeing an increased number of players frequenting a particular casino just like that so I think multiple casino membership should not be seen as a yardstick for an addict classification.
Registering on casino is very easy step which just requires email verification and that’s all. This easy steps make player have convenience to register and check the casino or try it for a small bankroll just to experience all their benefits that you mentioned.
There’s nothing wrong with that since there’s no commitment needed to register an account and you can abandon the account anytime you want.
I have multiple casino account which I casually accessing in case some casino have some good exclusive bonus.