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I don't know about the intricacies of FOF to say much about these. Seems like the intention is for this to be on the YMMV page for the source work, but I'm unsure if describing a particular fanwork on its page is disallowed.
Bump.
Any places I can ask about these before taking to Trope Talk? (I hope to boil it down to a more manageable number of questions first.) Might Is this an example? be helpful with some of these?
The My Immortal example at least seems like misuse, for the reasons you mentioned.
I have several questions about Fanwork-Only Fans:
While Trope Talk seems the best place to ask, I'm concerned this might be too broad/too many separate questions for a single thread, so I'm being here first to sort out/see if other thread might be the better place to ask some of these questions.