Government leaders and political policy advisors, intelligence agencies, hedge funds & quants, and large corporations doing crowdsourced forecasting for sure. That's probably why they haven't just been made illegal - the very policy makers are utilizing the data streams from this to predict the near-future to a decent degree. Companies like Cultivate Labs [1] go into the maths of it all but if you prefer videos Hypermind has some good ones [2] - anyone thinking this is just some degenerate gambler thing and criticizing them on those terms likely has no idea that people are doing pretty serious quantitative analysis on these things, to which use I will leave to your imagination

[1] https://www.cultivatelabs.com/crowdsourced-forecasting-guide

[2] https://www.hypermind.com/master-class

I thought the point of them is they are “truth machines” they give a financial incentive for the insider class to essentially share what they know.

The benefit to those outside the insider class are that we now have a better idea of the potential outcome.

Afaik, Polymarket removes predictions that break CFTC's regulations (this includes assassinations, etc., at least in the US). They basically provide no value unless you're an insider, but they do tend to be leading indicators so it might inform some decisions (like: should you keep your money in oil?) that could be contingent on Polymarket predictions.

Anyone can profit from an information asymmetry or mispriced markets--not just insiders with connections. If you are willing do do enough research you can in theory gain such an advantage. This is what some hedge funds do.

I would argue that the sole value of prediction markets is to make insider knowledge accessible to the general public, quicker than it normally would.

That’s why these platforms saying things like “we will roll out insider trading” is laughable.