Most of the people I know are actually long term losers and tend to simply boast about their winnings and hide their losses. They like to show that they can beat the casino, LMAO because that never happens due to house edge. But in a more rude way they are simply broke people and big liars.
I really doubt those why claim to be rich from gambling claiming to know some secret method to beat the casino.
As per my experience their is no one who is rich in casino gambling in long term, only those who played casino for short term as soon as they get profit they left it for ever to play, apart from that who ever is claiming in that 90% of them are fake.
Ya but if you take poker or sports betting you can say that you are rich in long term according to your strategy of betting on this gambling.