The emerging gaming regulations in China could place smaller developers in a bind, potentially leading to a decline in overall online advertising revenue. What Happened: The National Press and Publication Administration of China on Friday recently unveiled draft rules that disapprove daily sign-ins for games and other practices that generate revenue. Following the draft’s announcement, shares of Tencent Holdings Ltd (OTC:TCEHY), NetEase Inc (NASDAQ:NTES), and Bilibili Inc (NASDAQ:BILI) plunged to a yearly low, CNBC reported. The rules are up for review until Jan. 24. Kenneth Fong, head of Chin…