At the just-wrapped Code Conference, where a who’s-who of Silicon Valley, media, and political bigwigs converged last week, one company dominated the conversation: TikTok.As Axios and other news outlets reported , TikTok “was the talk of the annual gathering of tech world notables,” largely because of concerns about the social media app’s enormous influence (it boasts 1 billion-plus users worldwide) and its Chinese roots (the republic’s government has a seat on parent company ByteDance’s board and often exerts heavy-handed control over domestic companies). The complaints came from a variety of sources. New York University marketing professor and prominent media personality...