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.