Polymarket users did something impressive with US elections predicting every state right. But other than that it's not a good platform for betting.
I've written about this here:
https://bitcointalk.org/index.php?topic=5480541.0The platform's users can manipulate outcomes and close a market to whatever they want. Maybe Polymarket has tons of markets open but the smaller ones often close at the exact opposite outcome other than reality itself. I wouldn't trust it even with 10$ to be honest. Because what if the weird closing happens on you? What if those not afraid to practice manipulation end up targeting you?
If it happens once, it has the potential to happen all the time too.