Wang Sicong, the son of Dalian Wanda Group’s billionaire founder and an outspoken social media personality with 40 million followers, has opened fire on Meituan’s data policies just as the country’s dominant food delivery service is grappling with a fine for breaching antitrust rules.Wang said he was locked out of his account on Dazhong Dianping, the restaurants and review service operated by Meituan, when it was linked to another user’s mobile phone number, according to two of his posts on the…