There is no such thing as perfect online casinos because of the many rules and conflicting laws on the location of their players, there will always be accusations some could be valid some because of misinterpretation of the TOS, so I'd to ask all gambling players do you lose interest to deposit and play on the casinos you're playing if they have unresolved cases.
This may be one reason people quit gambling because of their unresolved issues on the sites but I think the majority of the people who do not want to gamble are the ones who have lost initially a lot of money and they do not want to deposit more and lose more money.
If you are winning, you will be interested to deposit more and winning more but when you started losing then you will want to stay away from gambling.
That's the simplest way to explain it, however some people are still willing to deposit their money even though they've lost, because they need to fulfill that emotional feeling that they need to recuperate those losses and when they do, that's when they are gonna stop. The only things that happened afterwards are just disappointment, frustration, and regret that they should've cut their losses the first time.
Once you knew the time when to stop, most of the time it is already too late.