Didi, the company that elbowed Uber out of China has been kicked off app stores in the country and warned that it mishandled sensitive data about its users in China. The regulatory pressure has upended its first days as a publicly traded company in New York, with shares plummeting nearly 20% on Tuesday and retreating even more on Wednesday. The government said it would strictly regulate what kind of information the tech companies in China send and receive across the nation's borders, and draft new rules about how to protect sensitive data related to overseas listings.