I don't know how it works. But, banning seems to be a favored activity by people who know very little but like to post a lot of pseudo professional stuff. They seem to get their hackles up when challenged.
I suspect that many folks post with the expectation that they will be praised for their posting and get their feathers ruffled when they are called on their errors...
In response to a request for feedback to a portrait series on YouTube which had an extremely heavy (more than Rubenesque) model with stark white skin wearing a tank top that exposed both her upper chest and her arms (straight on view also which made her look even more fat)... I mentioned that in a video on how to shoot portraits, having an especially heavy female dressed like that was a terrible idea.
The response was "you are banned" Actually, I had never intended to visit the site again because it offered nothing to me. I only found out about the banning because it came to me in an email...