@trdebunked Okay, basically, what you're saying is that even if a fanfic author is given an automatic permission to write a derivative work, it still is fan fiction?
My question then is, when is fiction a fanfic and when it is not?
Where do we draw the line?
Scenario #1: Author A dedicated their story to the Public Domain. Is it fan fiction if Author B uses that Public Domain work?
Scenario #2: Author D licensed their work under CC-By-SA. Author E wrote a derivative of that work, also of course under CC-By-SA. Is Author E's work considered a fanfic?
Scenario #3: If Author E's work is considered fanfic (based on Scenario #2), and Author D reused materials from Author E's work, is Author D's work also a fanfic even though D was the original author of that “world”?