The remaining 1% don't become rich. They might make a good living gambling, but they'll return the entire amount they earned, or even more, within a year or two at the latest.
So, it's not a 99% chance, but a 100% chance.
There's no such thing as becoming rich through gambling.
It's just a pastime and thrill for those with plenty of money.
I think it is still possible to become rich through gambling, but it’s a one-in-a-billion chance. And it would have to look like this: a beginner wins a huge amount right away within his first few tries, an amount that is more than enough to leave him satisfied and change his life. He doesn’t have time to develop an addiction. His need for money disappears, he views his gambling experience solely as a one-off, extremely lucky event, and never return to it again. Can this happen? Theoretically yes, but the chances are extremely small.