On April 1, Benson Sun, a former FTX social partner, posted an analysis on social media that at 18:30 today, ACT suddenly crashed 50%. The cause was that Binance adjusted the leverage position limit of ACT. He could only open a position of 4.5 million US dollars if he doubled the leverage. Some market makers' positions exceeded the limit and were directly closed by the market price. After the contract price collapsed, there was a huge price difference with the spot, and the spot also collapsed. The time for Binance to issue an announcement this time is 15:32 on April 1, and the time for effective is 18:30 on April 1, and the user response time is less than 3 hours. What’s even more outrageous is that on March 31, Binance issued an announcement to modify the position limit of ACT once, and on April 1, the position limit for low-plus leverage was cut by another 50%. Benson Sun suggests that Binance should first evaluate how many positions will be closed before modifying the rules. If a market maker has a large position, you should also notify it in advance. As the industry leader, I hope Binance can handle this incident properly.