Why are you framing this in such a way that treats one party as having agency and the other party as being immovable? The US is not banning TikTok, they are posing stipulations towards its use and you believe the CCP when they say they won't comply with those stipulations. But why is that a ban, versus "the CCP refuses to let TikTok comply with US law?"
Do you consider Google banned in China? The CCP had stipulations for Google's continued business in China. It was unable/unwilling to follow them, so Google left (voluntarily, infact).
I've never seen anyone argue that Google isn't technically banned in China. It's clearly a ban when China does it.
Yes. Is this even a contentious point? Despite the fact EU hasn't bothered to null-route an application that doesn't comply, they will impose onerous fines.
And what do companies do that don't want to comply to GDPR? They ban EU users. You can use the search bar here to find countless people talking about being banned. There's no ambiguity - there's only ambiguity when it comes to TikTok.
If I purchase a car with low gas mileage, and then the EPA requires cars to have minimum gas milage, that "bans" my car. Even though technically, I could figure out some way to rebuild it to comply.