This is simply false, at least in the US. A small majority favor banning it. It's not huge, but it's not a "deeply unpopular idea".
https://eu.usatoday.com/story/tech/news/2025/01/15/tiktok-ba...
I was a bit wrong in calling it deeply unpopular across party lines, but it's certainly quite unpopular overall, and deeply unpopular among Democrats.
Here's the actual poll: https://www.pewresearch.org/short-reads/2024/09/05/support-f...