Yeah. Also I think even if a work is "fannish" in the sense that it is by fans made in the context a fan community, that is still too broad, mostly because you can be a fan of genres and mediums, like science fiction fans, comic fans, movie fans, and be fannish that context and produce works, like writing original science fiction or publishing your autobiographical comic zine or making your no-budget amateur film etc etc, and that definition of "fanwork" would include pretty much anything with a creative community or at least all amateur/non-profit work, and I think that is overextending things.

And I think it would be unfair and unworkable to single special genres out, and make rules like "okay, we accept yaoi as genre for which both original and fanworks are allowed but not romance". Asking that the work is based on some other text/canon/source specifically is much fairer than that.