To be honest, the word "cured" when it comes to gambling addiction is confusing, because it either means you completely quit it or your successfully made some moderation towards gambling, so let me explain both sides that I've said. When someone wants to completely win against gambling addiction by fully quitting it, they need someone's help, of course they also need their self for this process, what I mean by "self" is their will and dedication of doing so, while the other one is that they need to go out somewhere else, to completely subside their urge on gambling, for example is like going on a trip to a place where it is remoted (no wifi) if possible, and appreciate the beauty of nature instead.
In these way, they could achieve their goal, slowly but surely, there is no shortcut on making your dreams come true.