More like Yelp. There is no evidence Amazon commissions or condones fake reviews (apart from being wilfully negligent in policing them), whereas review extortio

More like Yelp. There is no evidence Amazon commissions or condones fake reviews (apart from being wilfully negligent in policing them), whereas review extortion is a core part of both Yelp and Glassdoor's business model ("nice business you've got there, shame if bad reviews happened to it, but if you buy an advertising package, we will push them down so low they don't matter")