alt Hacker News>>At least in gambling they don't let the sports referees and players gamble.
Oh c'mon now. This is completely impossible to police. Players and referees are not under constant supervision. They have families, friends, partners. Some of them got caught but you can be certain most weren't because it's just very difficult to catch.
There are always multiple people who know about key players' injuries, illness, other factors. The game is negative sum and additionally insiders take a a chunk for themselves. It's worse then roulette which at least doesn't pretend to be fair.
It isn't impossible to police. Players and referees are under supervision...I am not sure why you think this isn't the case. Regulated gambling companies i.e. not Polymarket, maintain lists of people who are connected to sports inc. through family. And they maintain systems that monitor unusual betting activity that is shared across the industry, it is quite easy to detect this activity because most of the flow that bookmakers see is uninformed. So if you see a customer that doesn't bet regularly put down $10k, line moves in their favour...that is obviously extremely suspicious because that won't happen with 95% of the volume you take.
As an example, there was a football player in England who had a friend that bet on a transfer market (a market that is extremely prone to inside information). It was detected immediately (despite being a relatively small bet of $10k, I have heard anecdotally that insiders have been detected in this market down to $500 bets), the player was banned, fined $500k, etc.
Btw, the reason these systems exist is because there are certain sports that are too lucrative not to make a market in but the economics/nature of the game mean that matches are easily fixed: 99.99% of this activity is low-ranked professional tennis, and surveillance has been very effective (all of this is funded, not by professional tennis, but by gambling companies). Generally, this isn't as prevalent with US sports because none of those preconditions exist for the major sports.