Apparently over 200,000 people posted fake review on Amazon. Cybersecurity experts recently found an open database that contained a "treasure trove" of data related to organized fake reviews on Amazon. The database consisted of over 13 million records and 7GB of data, including direct messages between Amazon vendors and customers who provided fake review scores.
In total, over 200,000 people are involved and the evidence points to this being an operation run out of China.