Especially gutting after they removed the ability to download ebooks you've bought from their store and transfer over USB in February 2024.
You can use Calibre to put books onto a Kindle via USB
And that is why you should not buy this crap and things that are in a tight closed ecosystem.
I chose a Kobo for this reason.
After a deadline has passed, it will no longer be possible to load new e-books onto the affected Kindle models, effectively turning them into paperweights. - this is absolute nonsense, you've always been able to download books into kindle off your computer, via regular usb cable. Yes, it's a (minor) pain to have to convert them into this stupid, closed azw3 format, but callibre does that in little time.