China and TikTok's parent company ByteDance can’t be trusted. Regardless of what they say about protecting user data from abroad, there have been several instances of Western users being tracked, in addition to examples of the Chinese government leaning on TikTok to censor posts. The UK ban is another step in the right direction toward protecting users until the PRC proves it won’t use TikTok for nefarious purposes.
This TikTok ban is just another example of Grade-A xenophobia against Chinese companies. The PRC has made it clear it respects data security laws in all states and jurisdictions worldwide. Western countries are just trying to disadvantage Chinese competitors, but Chinese companies won’t be deterred, and will in fact be strengthened by these experiences.