Well, I got contacted by the seller, offering me $20 to take down the review. I ignored it.
Then a few weeks later, they upped the offer. And in response, I downed the stars.
Last I heard from them, they were offering me $70 to take down the review. For something that cost under $15.
Amazon itself doesn't help either. I bought something (a food item) from Amazon, and it was nowhere close to the quality in the photographs or description. I wrote a review, describing how the actual item was of much lower quality than expected. Amazon refused to post my review! And I've been an Amazon customer for nearly 20 years!