I think being a gambling addicted and having difficult to control personal finances due to this addiction is one thing, but stealing money from others to gamble is different and much more serious on my opinion. By doing this the person isn't harming himself only, but causing prejudice to third parties. It's the same as the drugs addicted that steals or kills to maintain his addiction.
When the situation reaches to an extreme like this only treatment isn't enough. Besides it, a punishment is also needed, otherwise the person will never learn how to respect others. As we live in society people must respect each other, doesn't matter if they want or if they have any kind of issue on their private life.
that's why all religions in the world forbid someone from gambling, because it has a bad effect on themselves and their families and even other people, when someone gambles and they lose of course they will be very desperate because they no longer have money, so inevitably they want or not will commit to be crimes, especially when someone who gambles will always drink alcohol and this will trigger them to do bad things.
It's not just religion that forbids it, the law also prohibits it and other people also prohibit or exile it because they don't want to be infected.
Gambling means being willing to risk something that was previously valued in the hope of getting something more valuable. As a result, a gambling addict ends up sacrificing everything he has, including possessions, lots of debt and crime or crime just to get money to gamble. and it can affect financial problems, work, to mental health.
and serious gambling addict should be cured completely otherwise it will result in suicide, seek professional help who can help him and delete or avoid the site as well or not come again to real casino, serious intentions and closer to God.