No one buys apologia that only the government can censor people. It has always been a dishonest deflection from real discussions pertaining to free expression.

There are two contexts where this can come up. A theoretical context where it is being referenced in an abstract manner. This happens around about 1% of the time.

Or 99% of the time, it is to distract from a controversial moderation decision by refusing to discuss that, because it just so happens to align with the views of whoever is invoking the argument.