That's apparently called "brushing". It was mentioned in this article a couple of weeks ago that talks about some of the methods that are being used to manipula

That's apparently called "brushing". It was mentioned in this article a couple of weeks ago that talks about some of the methods that are being used to manipulate the listings lately: https://www.buzzfeednews.com/article/leticiamiranda/amazon-marketplace-sellers-black-hat-scams-search-rankings https://www.buzzfeednews.com/article/leticiamiranda/amazon-m... It links to this article from last year that seems to go into more detail about that particular method too: https://www.buzzfeednews.com/article/nicolenguyen/amazon-review-reuse-fraud https://www.buzzfeednews.com/article/nicolenguyen/amazon-rev...