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…
Isn't this just reciprocity? China banned a long list of media companies: FB, Google, YouTube, Twitter, Netflix, and every traditional media. Now the US is banning two apps made in China.
Skype is available in a China.