We don't allow any published or copyrighted fiction or nonfiction on here so that isn't a problem. If you notice someone has posted any books, please let us know immediately so we can remove it. The opt out was an old policy when the site did allow individuals to share the ebooks they have of published works. It is no longer in effect because no one is allowed to upload published work. The most you will find is samples of work published by the author like the one for Bev Allen done by her request.
For Facn Fiction, they need to be the author or have the author's permission also since it is unpublished work generally. Please read the stickies in pink at the top of the Fan Fiction forum