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Unless of course the evil DDT corp bets money on it being safe, skewing the market.

That is the beauty of the Resolution part of prediction markets. If evil DDT Corp bets money to skew the market, then they lose even more money on the Resolution (assuming the resolution is deterministic of harm and has not been manipulated).

Oh good, the entire premise of the value of the system rests on an axiom with such giant and obvious flaws that you could drive a supertanker through it.

Does the resolution use the scientific paper that says "DDT is safe" or the one that says "DDT is unsafe"? There's no objective resolution of scientific facts.

"Prediction markets provide better information" in the exact same way that "Markets are efficient". You need to interrogate what "Better information"/"efficient" actually means even if you take the claim at face value, and also it's just not a model that maps to reality well.

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