it seems to amount to "you appear to like this author, so you might like some of his other books as well", without taking any notice of the type of story that I like
Yesterday I noticed one of my favorite authors had written a new novel. I intend to read it, though I may like it more or less. But from Amazon's perspective whether I like
a book is irrelevant - they care whether I'll buy
it. We should excuse their algorithm for predicting purchases
over customer satisfaction
Have my own pet for suggesting "If you like C and E, then you'll like G" (a chord).