Poker bots are out there. I have seen them in person. I passed on the opportunity as it is cheating other players. Casinos are pond scum, so I don't mind squeezing them for what I can. Taking from other players with the use of a bot is a little too evil, even for me.
Getting that crash before rollover is a common fear. Another fear is a higher losing rate when bets are upped. None of this has ever been substantiated with any of the major software platforms...with the exception of Boss Media. Even that was very obscure.