I think a book club is a fantastic idea, but I do worry for the smaller fandom authors. I also worry the distribution will be off as a result of this. Certain fandoms are saturated with writers and readers and others are not. I think the best way for this to work would be categorizing it by genre type like they do in “share your book” thread for fanfiction.
I think that would work best, since I really don’t like reading fanfiction involving celebrities, youtubers, etc. However, there is quite a large crowd that does (the BTS fandom is one that comes to mind immediately). However, branching out and reading more books within the genre of television, anime, etc. I think works a lot better. I think the other filter that may be necessary, is trigger warnings and maturity.