Isn't the whole idea of prediction markets to let insiders bet on things so that you'll get insider info leaked?

Maybe this is fine until it incentivizes easily-achieved but adverse actions that would greatly harm the public.

For a silly example, I would imagine the streaker from this year’s Super Bowl is either (a) a complete idiot, or (b) put a significant amount of money on a “prediction market” of there being a streaker at the Super Bowl - more than enough to cover his ticket, legal, and medical costs.