In a Progressive Knockout Tournament, each player has a bounty on their head which increases with each ♠ elimination. As a result, as the tournament progresses, the bounty on your head increases, making it more and more lucrative ♠ for other players to try to knock you out.
If you knock someone out, you get half of your ♠ opponent's bounty as a cash prize immediately. The other half goes into your bounty, much like with a regular PKO ♠ tournament. The obvious major difference is that there's no such thing as a bubble, or a regular prize pool. All ♠ the money awarded goes in bounties.
Most major poker sites have detection protocols to prevent bot play, but some of the more sophisticated 🌜 bots are able operate undetected, and some poker sites simply don't care about bots since their play produces rake (though, 🌜 they will ban a bot if they catch it, or if it's reported).
PokerStars, like other online poker platforms, uses a random number generator 🌜 (RNG) to ensure fair play for both real money and play money games. The play money algorithm is not designed 🌜 to be rigged to make players buy more play money.