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Amazon will remove the option to download/transfer Kindle e-books via USB by February 2025
(alternativeto.net)
This is a most excellent place for technology news and articles.
https://epubor.com/3-ways-to-remove-drm-from-kindle-books.html
It's astonishingly easy tbh. I think this might be the main reason why they're trying to stop you from getting the files on your PC.
Edit: that link is apparently promoting their own software, but the calibre plugin works very well, and as a bonus calibre is a great foss ebook manager.