The prediction market’s disciples and CEO believe its an unbiased way of knowing the future. But experts warn users could reshape the world to win big

In the early hours of 13 June, more than 200 Israeli fighter jets began pummeling Iran with bombs, lighting up the Tehran skyline and initiating a 12-day war that would leave hundreds dead.

But for one user of the prediction market Polymarket, it was their lucky day. In the 24 hours before the strike occurred, they had bet tens of thousands of dollars on “yes” on the market “Israel military action against Iran by Friday?” when the prospect still seemed unlikely and odds were hovering at about 10%. After the strike, Polymarket declared that military action had been taken, and paid the user $128,000 for their lucky wager.