Without additional signals, you can just as well use it to manipulate markets.

E.g. there's a 1-to-1000 bet for $1m today on Trump falling down the staircase. So markets read this and go crazy, buying up the stock. The next day, nothing happens and the markets go down. But somebody could have made billions betting on that.

> But somebody could have made billions betting on that.

Just because there's a small bid for 1-to-1000 on market, doesn't mean you can buy billions worth of contracts at that price.