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.