It still works for Amazon but it doesn't really work for books in their newer KFX format. It's best to use an older version of Kindle for PC or use their download and transfer to USB if you have a physical eInk Kindle to get an AZW3 file which should unlock no problem.
Installers for older versions are becoming increasingly elusive, I've found. Anything newer than Kindle for PC v1.26 and DeDRM can't break the encryption. Installers for v1.17 or v1.19 can still be found, but on Linux those versions can't connect to Amazon because one of the SSL certs used by the app has expired.
That leaves v1.21 as the "sweet spot", but most of the sites that used to host that installer EXE have mysteriously disappeared.
That workaround gets you the text but it's missing a lot of the recent typographic improvements. It's fine for extracting text for TTS, but isn't ideal if what you are trying to do is maintain a DRM free archive of books you've purchased.
It's like saying you can break BluRay DRM by recording the screen with your phone camera.
Stuff like drop caps, kerning that isn't terrible, hyphenation, and better word spacing. None of it matters if you are feeding the text to a speech synthesizer, but it can make a difference when reading.
Also does a very good job of metadata management and format conversion. I don't know of a better solution. With Calibre you can buy wherever you like and maintain the format and metadata system you prefer.
That's a good list. I've found some stuff I was looking for at Bloomsbury. Tor is probably good if you're into sci-fi/fantasy. But if you're looking for a specific book in English it's typically very hard to find a place to pay for a DRM-free e-book.
A search engine that covers all the little sites selling DRM-free books would be nice!
(Publishers of Norwegian books fortunately tend to have just do watermarks, which is fine – you can read the book on whatever device you want, and your copy has a little note saying "ex libris Your Name" or something)
Maybe it's just my pop fiction preferences but if I search for any sort of modern horror or sci fi fiction, I just can't seem to find any content. Pirate bay on the other hand? No problem. Like I said though, almost any modern non fiction and a great deal of older fiction literature is definitely there, so I'm definitely not criticizing libgen. It's mostly wonderful, though one worries about malware luring in downloads, but on this maybe im just being paranoid.
Besides TPB, is there a libgen for audiobooks? Audible blocks lots of books here and the prices are honestly quite steep. TPB often doesn't have what I was looking for, not even something obscure.