Restaurant tells everyone to leave bad ratings, because good ratings are hidden since they didn't pay extortion.
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https://www.reddit.com/r/food/comments/zdq0f/yelp_is_blackma...
Yelp "makes 4-5 star reviews go away" when restaurant refuses to pay extortion.
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http://www.cbsnews.com/news/inside-yelps-blackmail-lawsuit-c...
Stoppelman says that businesses want to control their reputation, and Yelp's position is to charge for that. Question here is, if money means hiding bad reviews, is that extortion? Sure seems so.
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https://www.forbes.com/sites/ericgoldman/2014/09/03/court-sa...
The courts said that "Pay to Play" isn't strictly extortion. And claims that Yelp themselves wrote bad reviews were unsubstantiated (no proof, server logs can be a 'tricksy' thing....).
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https://www.cnet.com/news/to-mock-yelp-restaurant-asks-custo...
This has gotten bad enough, that businesses are telling customers to seed YELP with good "Bad reviews".
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Seriously, when they call, and you fail to pay, your page on YELP goes to the toilet. How much "proof" do you need? There seems to be a misdirection by blaming 3rd party customers, but seriously. They're using blackmail as their market strategy.