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.
The bugs and issues are part of every online business in particular where transactions are involved.
Hackers are no doubt one step ahead of the developer. When developer secure the site - the hacker look for the loopholes. I am sure casinos hire ethical hackers too incase the website it attacked.