If it's the case that prediction market traders were trying to front-run the market outcomes, the prediction markets should put the fix on their end by locking down trading before a market closes with some time buffer to prevent this.
You can unilaterally stop trading 'before a market closes with some time buffer to prevent this.' No need for centralised action.
It is in a prediction market’s best interest to not become the place where you go to get fleeced.
Today they’re the Wild West and run like the early days of darknet markets, but if the
Commodities markets in the US only got anti-insider-trading rules very recently. I don't think fairness perceptions have changed much?
See also stock market trading, where companies would go to great lengths to shave nanoseconds off of getting information and putting in trades. Now apply this min/maxing to worldwide, unregulated and anonymous.
This is what tech libertarians / cryptobros want.