This is a must-read from Ted Savas.
If we are here talking about ginning up Amazon reviews, the spamming author is putting the publisher wrong vis a vis the Amazon terms of service. Amazon may ban the publisher forever once they detect the violation.
The author is either writing the reviews and posting under masked ID or is hiring a review company to generate the reviews.
Two bad outcomes await: pulled reviews (easy); termination of agreement (catastrophic).