An entity/person/company called "Literary Titan" sells reviews to authors to be posted on Amazon.
From their website:
The Service Includes
A guaranteed review within 45 days on:
Barnes & Noble
The Literary Titan
An author interview
Entry into our Literary Titan Book Awards
Your book cover added to our Instagram page
Your book advertised on our sidebar for two weeks
Buy link in the review to purchase your book on Amazon
Book review tweeted to our thousands of Twitter followers
Free access to a library that will help you sell more books:
“Building an Author Platform” by C.K. Louis
“Building a Marketing Strategy” by C.K. Louis
“How I Sold 80,000 Books” by Alinka Rutkowska
“Quit Wasting Time and Sell More eBooks” by Richard A. Peters
Book Review Service
They've been reported to both Amazon and GoodReads, but at this time nothing has been done. Beware when checking reviews, and watch out for this "reviewer"
Edit: They had also listed GoodReads as a site they post to, and did have a GoodReads account with the reviews posted. However GoodReads has recently removed them from the site.
In addition to the paid for "consumer" reviews scam, Literary Titan also has Affiliate links placed on their reviews which link to the book on Amazon. This is also is a violation of Amazon TOS, as it's another way for reviews to be paid for. It's something that got a lot of bloggers purged in the past.
Still waiting for Amazon to take action...