Using a poker bot is simply cheating. Poker is a game that is meant to be played between human beings, not computerized programs. So if you are caught using a poker bot, then the poker site will probably ban you for life, confiscate all your money and you will get blacklisted in the poker community as well.
Most people only talk about it being rigged after a big losing session or a bad beat in a tournament. The fact that so many online poker players have made hundreds of thousands, or even millions of dollars playing the game, proves that the games are not rigged.