Has there ever been a more expressively American app than TikTok, with its messy democratic creativity, energetic exhibitionism, utter lack of limits and vast variety of hustlers? And yet in April, President Joe Biden signed into law a bill that would force the Chinese owners of TikTok, the video-app juggernaut, to either sell to a non-Chinese owner or face a ban. Sign up for The Morning newsletter from the New York Times Congress passed the bill, which gives the company nine months to strike a