I’m not so worried about books, because there’s generally a human in the loop between writing a book and publishing it, but how long do we expect search engines to remain useable? Blogspam is already a real issue when it comes to finding stuff via search, I have a bad feeling it’s going to get much harder to find what you need to find as machine learning tools out-SEO humans.
It's very easy to get low content book published through Amazon's Direct Publishing platform. I don't really think it's a problem personality, but if you're opinion is premised on publishing being difficult I think it's misplaced.
