It was a got damn stunt, offc
Sec. 2) This division prohibits distributing, maintaining, updating, or providing internet hosting services for a foreign adversary controlled application (e.g., TikTok).
The “providing internet hosting services” seems like it could be an issue there
The law actually bans “providing internet hosting services to enable the distribution, maintenance, or updating of such foreign adversary controlled application for users within the land or maritime borders of the United States.”
If Google and Apple aren’t distributing, maintaining, or updating TikTok then it follows that nobody is providing internet hosting services enabling distribution, maintenance, or updating of TikTok.
Wouldn’t the ISP be liable?
Only if they hosted someone who distributed the app or update. Which nobody is doing.