Re: It's really quite simple
"... if it's out of print then tough..."
I was going to just downvote you, but decided to do this instead.
In this age where storage is cheap and plentiful, there is no excuse for anything to be out of print (read unavailable). Yes, there was for print editions, they are bulky and expensive to store - authors of my acquaintance have pallets of their books in the garage that they rescued from publishers who otherwise would have pulped them - and have a shelf life unless they were printed on acid free paper, but digital versions of books should be eternal. An author going out of fashion is no reason to prevent interested readers from obtaining a copy of the book.
Out of print isn't tough, it's negligence.