The problem of gambling addiction is not just about greed. Much of this problem depends on a person's psyche, genetics, and even social status. Many people have psychological or genetic problems that affect their lives and are beyond their control. Such people have a more pronounced predisposition to various addictions, including gambling. I don't think it's right to blame them for becoming addicted to gambling because of greed. They are more likely to be victims who need professional help.
You got me in your point. I agree with this that not all the problem of gambling addiction is not just about the greed but it is also true that in most of the cases the main reason behind of the gambling addiction is just the extreme level of greed.
And also gambling could be also a problem if a person even not being greed but playing on that time when he shouldn't. And as well for the religious conservative family, it could also be a cause of family problems. So yes, there are other reasons like this but what I think in this case gambling is just a source of entertainment if you see something in gambling that is ruining you happniness in your life then I can say we may should left the gambling.