There's a saying in poker that if you sit down at the table and can't immediately find the donkey(1), you are the donkey. At some point, anyone playing around in a prediction without insider info will be the donkey.
1: https://en.wikipedia.org/wiki/Glossary_of_poker_terms#donkey
Arguably it’s a very useful property of prediction markets as long as everyone is aware that’s the case.
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Yes, and let me add that that's by design. Prediction markets' main function is to incentivize people with private information to make it public.