Granting access to TikTok servers to multiple US agencies is 100% about letting the US spy on users (just as they have the right to under US law, such as the US CLOUD Act, and also via the well-documented and illegal warrantless surveillance programs we all know about). Blocking executive hires is clearly so they can prevent whistleblowers from working in the organization, and is exactly what the US did when it was using Crypto AG to spy on its allies:
https://www.washingtonpost.com/graphics/2020/world/national-...
Anyway, I'm against a ban of TikTok for the same reason that laws that target specific companies or individuals are unconstitutional. Instead, we should ban the things TikTok does that we think should be illegal, and then apply the law equally to US and foreign social media companies.