Polymarket and the like started to lose validity the second the general public started to learn about them and believe in their supposed accuracy.

The same people who were willing to throw money at cultivating positive media reporting and favorable "independent" pollsters will absolutely be willing to throw money at bad bets if it translates into shaping what the public believes will actually happen.

I suppose it does mean anyone not oblivious to the astroturfing can find absurdly favorable odds at least.