A forced sale would essentially gut them of their proprietary algo, which is leagues ahead of anything YT or Insta has. This algo and the associated TikTok assets can still be used a billion different ways around the world and in other apps.
Why would they ever want to help create an international competitor that could compete with them? I don't think any business would want to do that. Obviously the CCP has a level of access if they want it to data hosted in China, that's how it works with every company that has a physical location there.