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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.
Amazon was originally a bookseller, so it was their main source of income. I don't know how much money they make from MP3s, but it probably isn't much. I don't think DRMing their music is worth it for them. Many people view music as a service now and don't even own any music. I keep expecting Amazon to switch over to streaming-only like Google did.