That is a very good question. One that I hope has already been answered within the Administration.
lots of detail:
30 Jul: Inventiva: TikTok Hits Hard After India Took Its Veil Out: Bans Are Being Imposed All Around The World Alarming A Security Threat
By Priyadharshini Varadharajan
India was the first country to ban it, now other countries want to follow the suit...
More criticism came Tik Toks way in June. News reports that they have found that the app was snooping on the clipboards of users. This feature allows someone to copy and paste data from one app to another. These privacy concerns have led to lawsuits.
Tik Toks Chinese origins dont help it either. Under Chinas security law, the company has to share user data if the Chinese government demands it. The threat of snooping has led to several bans on Tik Tok. The US army and navy have banned it. The Australian defense department banned Tik Tok in January. Earlier this month, Tik Tok was banned from all Americans government-issued phones. Now the administration is mulling a complete ban. Lawmakers are patching for broader restrictions now. They want a complete ban for everyone in America. The US secretary of States Mike Pompeo stated that ETC...
https://www.inventiva.co.in/stories/priyadharshini/tiktok-hits-hard-after-india-took-its-veil-out-bans-are-being-imposed-all-around-the-world-alarming-a-security-threat/
After India and US, Japan looks to ban TikTok and other Chines apps
Techcrunch - 29 Jul 2020