If you think a book is made by the physical medium, you must think everything in paper is a book. The prose in a book has certain content structure, intent, and writing.
So unless a napkin and a receipt are books, what actually makes something a book is its content structure, intent, and writing. Not the paper it's printed on.
My Amazon account is, unfortunately, tied to AWS, Prime, Kindle as well as online shopping. I hate this, and I'm in the process of removing all of my stuff from all of these services.
