I had heard that the existing TikTok app will shut down in the U.S, with the investment consortium launching a new TikTok US app and re-training the algorithm on U.S. users only. If this is true, it might have the same effect: speedbumps where users have to download a new app and lose all their personalization often lead to massive drops in userbase, as they figure that if they have to start from scratch anyway, they might as well start from scratch doing something else.

They (Andressen et al) won't do it that way.