To cute the story short, someone claimed that he won a casino bonus and when he gambled with the money, he was so luck to win a huge amount and that was how he withdraw his winning and never used the casino again. After I read that comment, I just said to my self that it was really a great victory against the casino, that's why I decided to share it here to also give us an idea that this can be another means to say that someone flawlessly won the house. No?
So the whole idea of this individual in your story is that after being lucky on winning the huge amount he has not used the same very casino again? But if he has been using other casinos after all, then it doesn't make sense because he will be losing still in the process. More like robbing Peter to paying.
It was just a comment I read somewhere, so I can't really tell if he didn't gambler again after leaving that casino he won big amount from. But even if he gambled in a different casino and lost the money there, he won the first casino but was not smart enough not to stop gambling. He didn't realize that he will still lose to other casinos.