For many years Amazon fought fake and paid review sites. They have deleted reviews, both legitimate and fake, and now they will be requiring a $50 expenditure to post your review.
Here are more details from their press release:
These guidelines apply to Customer Reviews.
To contribute to Customer Reviews or Customer Answers, Spark, or to follow other contributors, you must have spent at least $50 on Amazon.com using a valid credit or debit card. Prime subscriptions and promotional discounts don’t qualify towards the $50 minimum. In addition, to contribute to Spark you must also have a paid Prime subscription (free trials do no qualify). You do not need to meet this requirement to read content posted by other contributors or post Customer Questions, create or modify Profile pages, Lists, or Registries.
What’s your opinion on the changes?