Polymarket and other prediction markets are still in a relatively early stage. If you are very familiar with major sports and esports events, there are good arbitrage opportunities. For example, just now I saw Wembanyama with five fouls, and Doncic hasn't even taken the court yet. I decisively built a position on the Lakers. At that time, the odds were only 24. My plan was to sell after Doncic came on and had a little rebound. I didn't expect the Lakers to keep playing better and better, showing a trend of turning the game around, until Wembanyama directly fouled out with six fouls, and the winning probability skyrocketed to around 80, so I went all in.