I agree that no one is entitled to positive promotion, but to argue that a massive platform that's established itself as the go-to place for consumer business reviews absolutely should be held to fair promotion.
I can't believe that this an argument on HN. You're saying that if you had a small business with a Yelp profile and I found your identity and started posting false negative reviews on your business profile, you'd have no problem being called by a Yelp rep to pay money to make them go away?