There is just one real working prediction market: Polymarket. However, it is currently illegal to use in the US, because of old laws. This can be circumvented with cryptocurrency, but most Americans still won't use such a hack. Which strongly limits the popularity of Polymarket, as US Americans happen to be the people who are most interested in prediction markets.

There are also the prediction ... platforms Metaculus and Manifold, which are legal in the US, since they only use made-up internet points instead of real money. I'm not sure whether this even hurts their accuracy compared to Polymarket though.