Could you explain?
From my experience, they are exact digital copies of the ebooks on amazon. It’s not like mp3 in lower audio quality, it’s word by word the same book.
I tried downloading several Dresden Files ebooks from Anna's Archive. They contain various difficult-to-understand errors including word substitutions that tend to ruin the text. AA offers several editions, but they appeared to be the same error-filled book in different file formats. The errors are not present in the Kindle editions of the same books.