Amazon is not helpful when it comes to answering your questions. As author, they can be the worst to deal with. You ask them the same question three or more times and they copy and paste the answer before giving you more information. They give you 5 days to prove you own copyright over your own books especially those published on another website or you use public domain content. When using public domain, they will request you for a signed document to prove you have exclusive rights to use the materials freely. It took a whole day to change one book's content because of this requirement from them. Everything I gave them was not accepted as proof. The issue is there is no way to prove a public domain content version of the World English Bible to them. All the sites that I found says it is public domain. If there was a better place to publish with all their benefits, I would choose that one over them. I just like that I can still get royalties when people read my ebooks and they have ads to advertise your books. I can distribute globally and people buy my books there more than other platforms. Otherwise, I don't like them. They are troublesome to work with. I heard others complain about their author experience with them. They won't pay you for royalties you should have gained if the book page reads doesn't count them. You lose those royalties. They don't know how to do their job well or to be more considerate for the author's needs.