To be honest, I have never seen someone become rich from gambling, what happens is the opposite, I have seen many of them become financially difficult because of their gambling activities.
Maybe there are people who can become rich, but the number is very small, and those who can become rich from gambling are not users but those who have businesses in gambling. I myself have suffered more losses than wins, and even if I win, the amount may only be able to recover the amount of my losses, or even not cover it at all.
I also havent seen anyone who became rich, but I have seen people who have gambling as a hobby that brings them money. During period when I was in university, a noticeable amount of my friends played poker online. They were playing poker with low stakes or freeroll tournaments. Not saying that won millions, but often after a night of poker, they managed to increase 20-30 usd balance for around 5-10 dollars. Not much, but if you have a job and earn about 20-30 usd weekly from hobby, that is nice. However, if someone consider that he will earn for a living with gamble, then I would strongly suggest him to reconsider that and find a job.
Of course, I would also not recommend making gambling a job, because the risks involved are very big and there is no guarantee that we will win at gambling, on the contrary, we might experience a lot of defeats.
Making gambling as a hobby is legal, that means we use gambling as a way to just have fun. But we still have to have limits even if we only make it a hobby. Because if we don't have boundaries then in my opinion it will still be the wrong hobby.