Most gambling "games" are quite a lot harder to acquire and use insider knowledge on though.
People don't play in corrupt markets for very long.
The movie _Casino_ highlights how insider information was and is used to improve the house odds [0].
Information about a players wellbeing and their life goes a long way. Example, they would pay paper boys to talk to coaches to find out non public information. Such as if a player of the team is going through relationship problems.
"People don't play in corrupt markets for very long." ... ahhh, it's not a bug with Polymarket - it's a feature.
Sports betting has been around forever, and it has been gamed forever. Gambling is often an addiction and some cheating doesn’t stop people from doing it