Here's an odd, maybe edge-case example. Joel Chandler Harris' Uncle Remus stories are clearly outside copyright. It's for sale on Amazon (the first link when I searched, becauseofcourseitis!) but I think we all know that the "copyright" on these published editions is only going to cover the Foreword or whatever the publishing company slapped on.
When I look for it on archive.org I initially thought I could only borrow it [1] but then searched harder and found another copy that I can in fact download [2].
[1] https://archive.org/details/completetalesofu0000harr
[2] https://archive.org/details/the-complete-tales-of-uncle-remu...
All of this aside from very reasonable arguments that copyright shouldn't apply to consumer uses of information.
I don't really share your moral views on piracy, so why both browbeating with them?
I don’t support/condone piracy, but I also don’t support the current trend of taking away user rights.
Next on the list will be the removal of the ability to transfer via email. Just wait.
That being said, all kindles can now be jailbroken: https://news.ycombinator.com/item?id=43073969
So you can use other legit sources when possible.