To calculate the overall star rating and percentage breakdown by star, we do not use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
Some of the ideas the author discusses are difficult in implementation primarily because of logistical or human reasons. The author comes across as naive and lacking in interpersonal interaction experience. Some of the concepts discussed would go drastically wrong in reality.