Google stole the business of quora and trip advisor. They did the hard work of getting the content.
Google NLP algorithms use quora and trip advisor like training data sets. This is theft!
My guess is that Yelp is next.
EDIT:
I have no affiliation to those businesses, just that as someone interested in websites and internet businesses, its clear that its much harder to build a consumer facing content based website now. The content is simply extracted and stolen. How can we have a thriving internet when such monopolistic and profit driven practices stifle innovation and creation on the web?