Instagram and Facebook is more popular outside the US and China than TikTok.
TikTok-based social media campaigns also e.g. managed to unexpectedly swing an election in Romania (for Georgescu, was later annulled).
[1] https://www.absatzwirtschaft.de/tiktok-vs-instagram-ein-verg... - sorry, I only found a German source
This specific campaign was done via TikTok, though, and had massive impact, which shows that TikTok has heavy usage and is popular, outside of the US and China.
(I'm not American, I have no horse in this "ban foreign TikTok" race. :D)
Why they've done it via TikTok - I simply don't know. :D
Maybe better discoverability via the For You page?
maybe next Christmas if I'm not on the Santa naughty list