Look, I'm not arguing whether it's legal or not, whether an author would win in a court of law. It's up to the fanficcer whether they abide by the wishes of the author and for what reasons.
The issue with MZB came about because MZB encouraged fanfiction, read it, and even participated in some of it herself. (This was back in the late 80s, early 90s, mind you, long before the internet as we know it, probably back to the oldest days of usenet groups.) That's where the "I'm not going to read your stuff because I may lose value" came into force, and where authors became chary of fanfic.
no subject
The issue with MZB came about because MZB encouraged fanfiction, read it, and even participated in some of it herself. (This was back in the late 80s, early 90s, mind you, long before the internet as we know it, probably back to the oldest days of usenet groups.) That's where the "I'm not going to read your stuff because I may lose value" came into force, and where authors became chary of fanfic.