It's not so simple, because the machines that rank products and serve search results are evaluating the reviews too. As those machines look for signals of "aut

It's not so simple, because the machines that rank products and serve search results are evaluating the reviews too. As those machines look for signals of "authenticity," review factories learn to manufacture reviews that fake those signals. If adding a small mix of two-star reviews helps with search rankings, the review factories will start doing it in a heartbeat.