The ban of an app like TikTok is absolutely unprecedented and is very atypical. This isn't par-for-the-course behavior by the US government, and the outcome of this ban will set a precedent for other apps the US bans on "national security" grounds.
The most recent example was Grindr which was first sold to Chinese company and the government had to force them to sell it back because the app contained location info of potentially sensitive military personnel.
Didn't they ban the use of Huawei in all telecommunication infrastructure a few months ago?