> My point was that 3 of 4 uses of hyphens were wrong.
Wrong according to whom?
We're not talking about writers for a newspaper or magazine, where everyone is expected to adhere to a single style for the sake of uniformity.
James Joyce did a number of things "wrong" both grammatically and stylistically, but that was part of the artistic expression. It's weird, to say the least, for a bookstore to enforce style. When I walk into a physical bookstore, I expect that the bookstore has made some decisions around book placement[0] for the sake of optimizing sales, and books that have bad grammar may not be as attractive. But I don't expect that they have made decisions directly based on the grammar of the books ("we dislike the way you use punctuation, so we're going to put your book in the back of the store, or take it off the shelves altogether").
Amazon is now trying to eliminate the need for publishers, but in that process we should be clear not to conflate the role of the publishers (which includes editing) and the role of the marketplace.
[0] Incidentally, most brick & mortar bookstores are organized by genre and then either title or author name, so the extent to which they can even 'demote' books is generally limited to the ability to place books "cover out" instead of "spine out". With the exception of keeping adult-themed books in a special section and promoting certain books in a themed display (e.g. "Staff Picks for Summertime Reads"), bookstores don't really take heavy action against books based on content.