Since my last post, I have come across a page written by someone who was an eyewitness to the events: The Edge of the Creative Commons, by Brent Laabs. He validates my criticism and also offers some additional information about when and why the change from BY-SA to BY-NC-SA happened. Well worth reading.
I’ve submitted this as a story to Techdirt, and I’m contacting others. Let’s see if I can make a fuss over this.