https://arstechnica.com/gadgets/2020/09/amazons-top-uk-reviewers-appear-to-profit-from-fake-5-star-posts/

Amazon is investigating the most prolific reviewers on its UK website after a Financial Times investigation found evidence that they were profiting from posting thousands of five-star ratings.

Justin Fryer, the number one-ranked reviewer on Amazon.co.uk, reviewed £15,000 worth of products in August alone, from smartphones to electric scooters to gym equipment, giving his five-star approval on average once every four hours.