We're banning the company not the ability to express. They can upload the exact same videos to YouTube shorts, Instagram Reels, and who knows how many alternatives.
ByteDance is a Chinese corporation. The US federal government does not govern it and has no responsibility to allow a Chinese corporation to express itself in the US by publishing propaganda.
This is the foundation of reciprocal trade agreements:
We don't put tariffs on your cars if you don't put tariffs on ours. We don't ban your social media companies if you don't ban ours.
Are we doing this because they banned Facebook? Again, I don't think so.