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Obviously as an author I can make several cases for author anonymity and pseudonyms but reviewers, I can't really make a case for.
As much as I understand the idea behind this I can’t ever see it happening. "Hello, Amazon? You know you have millions of people participating in discussions and advertising your site by word of mouth, controversial news stories, book reviews, link sharing? Could you pretty much annihilate that number by forcing people to give all of their personal details? It's ok, you can tell people you won't reveal or sell the details if you think they'll buy it. Kthanksbye...”