When one plays gambling for fun it does not have much effect on him but when one chooses it as a profession it causes him a lot of financial loss. Because the more serious you are in gambling and the more you panic, the more you will lose. So of course gambling can make someone poor. But it is not very fast. A person gradually increases the amount of gambling as he gradually becomes addicted and gradually loses his wealth.
I agree with what you said, someone who gambles for fun is unlikely to experience problems that affect them, but with those who gamble for the purpose of making money or making it a profession as you said, then they could experience quite serious or even big problems and will affect them financially or mentally, because there are also those who I think have mental problems when they have experienced big problems because of gambling.
It has become a certainty and there are also many cases that occur about someone who becomes poor because of gambling, if they do their gambling gradually with increasing behavior in gambling, then addiction is something that is likely to happen including its consequences.
Honestly, if we say that we gamble not to make money but for entertainment, it sounds like a lie. I don't believe that there are people who gamble just for fun and don't care about winning or losing. And I don't think gambling for money is bad or will make us poor. If we gamble according to a plan, with discipline, and only play with money we can afford to lose, we will never fall into poverty.
But I agree that making money from gambling should only be done when you have free time, never turn it into a career or think of relying on it to generate income. That was a really bad and stupid idea. It all depends on us, don't blame gambling when we are greedy, lazy, and get rich quickly...