Besides gambling games have been perfected over thousands of years so it is very difficult to find flaws in them, and the ones that can do it are for the most part very intelligent individuals which notice they can get a very small edge through an enormous amount of effort, so unless someone can find a bug at an online casino and exploit it then there is not much of a chance for them to find a way to beat the casinos and the house edge which favors them in every single game.
Exploiting bugs or vulnerability of the games is considered as illegal activity and your account might be terminated since the casino think you're doesn't want to lose and only want to chase winning for your side. This will make the house suffer huge loss if they're not taking a quick action. If a player make a report to the casino about the bugs he found out, he might got compensation and probably hire you become their team.