I discovered recently that if you sideload a book onto the Kindle via Calibre, Amazon can delete them silently at some later stage if they decide you didn't purchase it from Amazon. This includes public domain works.
It's allegedly a result of how Calibre manages tags in order to display covers but still feels deeply wrong.
It's allegedly a result of how Calibre manages tags in order to display covers but still feels deeply wrong.
Long thread here: https://www.mobileread.com/forums/showthread.php?t=340936