Can one know how many people are in that market? When prediction markets where mentioned early during the LK-99 story, I looked a bit around out of interest, which platforms exist, which topics they cover, how many people participate in that markets. Where I could find the number of predictors, it seemed pretty underwhelming - one, ten, fifty, a hundred, I think the highest I ever saw was a bit over a thousand, but even then less than a hundred or so where using real money, the majority was using play money. Did I miss the place where everyone is? Is this to expected because the are so many topics you can bet on? Are the resulting prices still meaningful even with a small number of predictors only?

The sensible thing would be to bet against it - as shown by xkcd

Did that site predate https://xkcd.com/955/ or was it inspired by it?