This from Google.
More than a dozen countries have banned TikTok, including Afghanistan, Australia, Belgium, Canada, Denmark, India, the Netherlands, New Zealand, Pakistan, Taiwan, the UK, and the European Union. Some countries have full bans, while others have partial bans. For example, Australia bans TikTok on devices issued by some government agencies, while Belgium bans it on federal government devices.
The US military services have banned Tik-Tok and Bytedance use by service members. They cannot ban family members from using it however. This is a real security threat because service members can be tracked by Tik-Tok family members. That is not to say you are tracked anyway by metadata spiders, But you can use tracking blockers, and VPN's but as long as Tik-Toks servers are located in China tracking blockers will not work.