> So, Youtube and others are indeed censoring you when they do not allow you to publish certain videos.

Except YouTube does not prevent you from publishing your videos. They only prevent you from publishing them on YouTube. You can publish them on another platform, or self-publish them.

Censorship is usually taken to mean suppressing or attempting to suppress a work from being published at all across some reasonably large population, which is generally something only governments have the power to do.

One might make a case that a private organization that has acquired a monopoly or near monopoly could do so, but YouTube is not yet there.