The stance of the US is that ByteDance has to sell off what is already a separate product (TikTok).
Google, Facebook etc don't have a "Chinese market" product at all, so there's nothing to sell off. If they did have a Chinese market product, worth many tens of billions of dollars, they would very likely sell it rather than spike it.
Using that logic, facebook, google, etc are not businesses either since they chose to be banned from china.