Author Reviews Violate Amazon's TOCs - Seriously?

In recent weeks there has been a lot of controversy surrounding authors reviewing books on Amazon. A post by Suw Charman-Anderson covers the story in more detail. It seems that authors are now banned from reviewing all books because they are seen to be in direct competition with book products.

As an author, I don't see myself as somebody in competition with other authors. If another writer publishes a book similar to one of mine, I'm delighted to see it do well both for the author and because...