There's an interesting article on The Verge about if using a bug to beat a video poker machine should be considered hacking hacking? Read: Federal court questions whether using a bug to beat a video poker machine is hacking | The Verge Personally i dont think taking advantage of a computer bug should be considered hacking, you were always able to do that in the game, even if the game was not intended to work that way. Its not like you modified the game to allow you to do that, you just found it could be done through normal playing.
Well, casino owners will do anything to not loose their money. Even if you are too good at poker, soon enough they won't allow you to enter and play. So, yeah, i am not surprised.