Because the US can control the topics shared in the other platforms, but since tiktok is owned by a chinese parent company, they can’t

Also, tiktok was originally told they had to sell to a us based owner to avoid the ban (see hostile takeover)

This ban has nothing to do with privacy and Chinese manipulation, and everything about control and profits.

Hell, Besos and The Zuckster are the two main forces pushing for this ban.