Even really simple rule based bots like Turbo Texas Hold'em can beat most humans. Pokibot, developed by the university of Alberta was able to beat even somewhat experienced poker players at limit holdem using a few simple rules plus opponent modeling using action frequencies.

PokerStars has one of the best bot and collusion security prevention teams in the industry. They take this very seriously. But of course whenever there is money involved in anything in life, people will try and cheat. So it doesn't stop people from trying to run a bot on PokerStars.

On April 15, 2011, the U.S. Attorney's Office for the Southern District of New York seized and shut down Pokerstars and several of its competitors' sites, alleging that the sites were violating federal bank fraud and money laundering laws.

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