> It beggars belief that Yelp has gotten away with it. I have heard from 4-5 restaurant owners the same story: it costs $300 to hide bad reviews.

Is there documented evidence of this available? Emails with DKIM signatures, recorded conversations with representatives who can be confirmed to work for Yelp, official Yelp correspondence, etc? Basically anything that can actually make a solid case instead of just anecdotal evidence.