They will but that doesn't usually happen in reality as often times, most gamblers would say that why would they help the casino find it when they have their own stuffs to do it and apart from that, they will not because the prize will not be as big if they will take advantage of the bug themselves. You know, those kind of mindset that do it now without trying to look for the consequences down the road because the important thing is to make money.
Well, surely there will be people who try to take advantage of these bugs for their own benefit. But at least if they find a bug, they can report it to the casino so the casino can fix it. The casinos may reward them for what they find but it depends on the casino. And if the casino runs a bug-finding contest, it can be a great place to practice its bug-finding skills. And there's a prize for those who can find the bug. And who knows, the casino is interested in hiring him as part of the casino team.