If you pay for an e-book that has DRM (digital rights management) on it, you aren’t really buying it, no matter what the vendor says. At best, it’s a long-term lease which can be revoked at any time. Amazon has made this plain by removing the ability to download permanent copies of any and all e-books you may have “bought.” As of February 25, 2025, you will no longer be able to download your “purchases” to a device that isn’t directly under Amazon’s control.

If you care about keeping what you “own,” you need to download all your “purchases” before then. You have to do it one book at a time, which can get tedious if you’ve “bought” a lot of books.
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