Well I can't possibly State their reasons but one thing for sure is there's a reason behind that which I can't tell, but the most common reason why most gamblers jump from one casino to the other is due to the fact that the casino is lacking trust or maybe they noticed a sign of incompetent or they don't meet up to their expectations or probably to try a different thing. I sometimes leave my favorite casino to try other ones to see their features and if I see that they have good features with good reputation I would stick to that casino for the main time.
I personally think the most common reason why people leave one casino and go to another one is that the other casino is providing a better bonus or running a promotion that has caught their attention, and once they create an account there and take the bonus, if they like the casino, their customer support, and other things like games, etc., they might stick to that casino, and besides, a gambler will never stick to a single casino, ask every gambler in this forum, and you will realize that almost every gambler uses multiple gambling platforms for some reason.
I myself use multiple platforms, sometimes because of promotions, sometimes because I might like the general UI of platform for a specific purpose like sportsbook, because I have used so many casinos for their sportsbook, some of them have proper layouts and everything and their UIs are very user-friendly, and some of them don't have that, so I try each platform and then choose where I should make my bets next time. So there can be different reasons for people to use multiple casino platforms.
