Originally Posted by ApK
It is a totally out of context mention of a unsubstantiated guess from earlier in the piece with no connection to the section I quoted. And if that WAS the writers intention to link the part I quoted with that, then I'm doubly of suspicious of the writers composition abilities, and their ability to make arguments and draw conclusions.
I agree that the sentence you refer to (starting "But what if someone got the book from a library or borrowed it from a friend?") does not follow as any sort of conclusion from the immediately preceding paragraph - as the "But" would have you expect. So yes, that is a definite fault.
However there is the paragraph "If removing reviews does have to do with Amazon verified purchases ..." just a short distance above, in the same section of the post, so the context was present and (I thought) easily understood. It just needed an editor to tidy it up a bit, though I'm not sure how common place it is to get blog posts professionally edited. I know that I did not go to extremes editing this post, so there could be some (hopefully minor) faults.