That's assuming the prediction markets all play fair and by the same rules. If Polymarket were to do that, its competition could choose not to. Since these exchanges are not tied to any one country (or jurisdiction), its users would jump ship. Because the users don't care.

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.