who tried an experimental cancer therapy he found online. The 21-year-old college student was named Wèi Zéxī (魏则西), who studied in Xidian University. Wei was diagnosed with synovial sarcoma, a rare form of cancer. He found the Second Hospital of the Beijing Armed Police Corps (武警北京市总队第二医院) through the search engine Baidu, on which the hospital had been promoting itself. The treatment proved unsuccessful and Wèi died in April 2016. After Wei's family spent around 200,000 yuan (around US$31,150) for treatment in the hospital, Wei Zexi died on April 12, 2016. The incident triggered massive online discussions after Wei's death. On May 2, 2016, Cyberspace Administration of China (CAC), the top watchdog for China's Internet space, dispatched a team of investigators to Baidu. The case is still ongoing. One report claimed medical advertising makes up for 30% of Baidu's ad revenue, much of which comes from for-profit hospitals that belong to the "Putian Network", a collection of hospitals across the country founded by medical entrepreneurs associated with the Putian region of Fujian province. The investigation led Chinese regulators to impose several restrictions on Baidu, including adding disclaimers to promotional content and establishing channels for complaints about Baidu services. In addition, Baidu's search function now largely directs users to contents published on platforms under Baidu's control, leading Chinese media scholar Fang Kecheng to proclaim that "Search engine Baidu is dead". Commercialization of Tieba Baidu sold the hemophilia online community, one of the communities of Tieba, to unqualified hospitals. In January 2016, Baidu announced that it will stop selling all of its illness-related Tieba. On January 12, Baidu officially announced to the public that all Baidu Tieba for all types of diseases will completely stop commercial cooperation and will only be open to authoritative public welfare organizations. In response to Baidu's decision, Lin Jinlong, president of the Hunan Medical and Health Industry Association, said that private hospitals have entered a period of industry transformation and upgrading, and are neither dependent on posting bar ads nor counting on competitive rankings anymore, so Baidu's decision will not have a negative impact on the industry. DO Global subsidiary ad-fraud in downloaded apps On April 20, 2019, it was reported that several applications for Android devices developed by the subsidiary company, DO Global (formerly DU Group), were surreptitiously running revenue enhancing background programs on user devices since at least 2016. These programs, part of six known applications