Photo-Illustration: Intelligencer; Photo: Getty Images There are two main reasons prediction markets have blown up in the past couple of years. One is that they offer a large group of people something they want: the chance to put money on a wide range of outcomes, from sporting events to elections to how many times Mr. Beast will say the word dollar in his next video . The other is that, until quite recently, they weren’t really legal. Things opened up for Kalshi, which had been seeking full