At the just-concluded Code Conference, which brought together the who’s who of Silicon Valley, the media, and political leaders last week, one company dominated the discussion: TikTok. As Axios and other news outlets reported, TikTok was “the talk of the annual gathering of tech personalities,” largely due to concerns about the social media app’s massive influence (it boasts more than 1 billion users worldwide) and their Chinese roots (the Republic’s government has a seat on the board of parent company ByteDance and often exercises tenacious control over local businesses). The complaints came from various sources. New York University marketing professor...