I can think of one - banning superior foreign products and services mean that people have to use inferior local substitutes. Just because the CCP doesn't want Chinese people to use the best available products is no reason to deny them to Americans. Americans should have access to the best products that they can afford.

This logic is "they make themselves worse off, so we should match them". That is lose-lose scenario logic.

That being said, there is always an argument for banning foreign social media companies (really all media companies) from making commercial profits in other countries. The political and military risks are significant.