To be clear, this is not Forbes. This is forbes.com/sites/ which is an unedited blogging network. So long as a blog brings in clicks and doesn't cause problems for Forbes then they don't much care what is posted.
It's not unreasonable to expect Forbes' editorial control to extend to everything they host on their domain.
If it's at forbes.com, and has Forbes logo at the top, it's Forbes. If they don't like the brand damage this is creating, tough luck: they can't have their cake and eat it too.
Forbes, the blog farm that used to be a magazine.
Forbes died the moment Forbes himself died. This was in 1954. Forbes, the magazine, has been going down hill since then, and most of us have only been alive for around half that time.