Rebecca Davis editorThe Chinese government has taken a stake and one of three board seats in a key subsidiary of TikTok owner ByteDance, reports said Tuesday, reviving debate about whether the popular short-form video app poses a national security threat.Chinese authorities now own a 1% stake in Beijing ByteDance Company, a firm that owns key licenses to operate Chinese platforms Douyin, the country’s version of TikTok, and the popular news app Toutiao.