When I first read about it (not from the sensationalist Daily Mail article) I also got the impression that while the search engine is part of it, the content of the books makes the fact that they are even on sale on these websites an issue.
It's not just adult material, it's the graphic and offensive nature of it, and as one of the articles mentions: On Amazon, guidelines for self-publishing state: "We don't accept pornography or offensive depictions of graphic sexual acts."
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