The incentives are different than with traditional books because prediction markets aren't setting the odds and risking being way underwater if the wrong outcome occurs. It doesn't matter to the prediction market platform which outcome realizes.
Since they don't bear that risk and don't have to pay people to figure out where to set the lines, they can charge lower spreads too.
We will definitely see lots of bad actors exploit prediction markets but they seem like an improvement on traditional books to me.
