Or they will lose a decent amount, and then they will already understand that the game was dishonest) I would gladly tell the casino so that they can protect themselves for a reward.
Not many people would be happy to tell a casino about a bug in their casino but instead use it for themselves. If you have such intentions, you have good intentions and it will give you something and the casino will probably reward you. It will be better for you because you are not using the leak in the server personally but can tell the casino so they can fix it quickly.