Maybe I was not clear enough on this: I'm not claiming my book was censored, at least not in the traditional political sense of the word.

What I'm saying is that the way the book got blocked, is a harbinger of what future physical book censorship could look like. Once the techniques developed for social media moderation make their way into physical book publishing. Amazon happens to be ahead of the curve there, whereas other printer companies are probably still a bit old fashioned (which is good news).