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True! Although ordering a book off amazon doesn't tell them that you bought it for you, or that you read it, or when, or how, etc. That doesn't stop Amazon from making assumptions about you that can be used against you, but the less ammo you give them the better.

Even bookstores don't always guarantee your privacy these days and libraries just keep getting worse on the privacy front. Librarians fought hard to keep the government from collecting lists of the books we check out, but they lost that fight, and now they're pushing users to use third party apps to download DRM filled digital ebooks.