Chinese officials have announced that they have begun investigating Didi, a major ride-hailing service. It seems to be part of the tightening of regulations on IT companies. The Chinese government’s Internet crackdown department said yesterday that it has begun a national security investigation into China’s largest ride-hailing service company, Diddy. No specific details have been announced, but it is explained that the investigation is based on the National Security Law and the Internet Safety Law. Due to the suspension of new user registration during the survey period, the stock price of Diddy, which has just been listed on the New York Stock Exchange in the United States, has fallen. In China, the squeeze on IT companies is increasing, with Alibaba, the largest online shopping company, and Meituan, the largest food delivery app, being caught.