I don't get it. It's US companies standing to loose their stronghold (near monopoly) on social, advertisement, and other forms of monetizing the web if the US creates a precedent for "national security" in this way, as in "we're welcoming social networks and free speech as long as it benefits the US and can be searched without warrant." Quite predictably, governments all over the world will be pressurized to question…
It can be a real threat to national security[1]:
> Thursday's order alleges that TikTok "automatically captures vast swaths of information from its users," such as location data and browsing and search histories, which "threatens to allow the Chinese Communist Party access to Americans' personal and proprietary information -- potentially allowing China to track the locations of Federal employees and contractors, build dossiers of personal information for blackmail, and conduct corporate espionage."
It has nothing to do with other Western nations. It's about protecting your citizens from aggressive foreign states that operate based on completely different values.
I would consider going even further, and banning all Chinese researchers from the top US schools[2]:
> Seventy-one institutions, including many of the most prestigious medical schools in the United States, are now investigating 180 individual cases involving potential theft of intellectual property.
> Almost all of the incidents they uncovered and that are under investigation involve scientists of Chinese descent, including naturalized American citizens, allegedly stealing for China.
[1] https://www.cnn.com/2020/08/06/politics/trump-executive-orde...
[2] https://www.nytimes.com/2019/11/04/health/china-nih-scientis...