Its not about just listening in. It's about influencing an entire generation with ideals that benefit a foreign nation.A few years ago US (NSA) was caught red handed listening in on talks between european leaders telephone calls.
I think its a fair assumption that they're probably still doing that somehow. Actually I think that intelligence agencies in US will do whatever it takes to "stay informed" about whatever is going on anywhere in the world.
So yes - we can ban TikTok and if I was a leading a country I would not have any kinds of SoMe apps installed on my workphone, no matter what country they were made in.
Looking at how different super powers are positioning them self around the world with military presence, I think its puzzling that the US is so afraid about what other countries are doing. But this is a democracy and what we all say goes... 🤷♂️
Don't get me wrong, I have no doubt the US and other western countries would pull the same strings on Chinese citizens if it were possible - but currently it's advantage China as the great firewall prevents it.
They play a much longer game over there than any government in the west (with their relatively short political terms and internal bickering) is capable of.