Not censorship, true. But then neither is it a forum when the rules of participation are kept secret and then enforced without explanation by arbitrary whim.
Those who complain about the moderators here are almost invariably those with the least to contribute. The rules of this forum are clearly explained, and you’ll find them in plain English here and here.
Here’s part of the guidance you seem to not understand:
Act professionally and use common sense
Audiogon is a business site; all members are responsible for maintaining a professional and cordial demeanor on and off the site including our forums.