While they're at it please remove Yelp. The page that comes up on mobile does not appear to be the one Google indexes. It only shows the first sentence of a few reviews. Clicking Read More or More Reviews bounces you straight to the Google Play Store to install the Yelp app.
Yelp has some of the worst practices in the industry. Quora at least shows you some of what you want, while Yelp will stop at nothing to force you to log in and/or download the app.
I suspect if Yelp clearly runs afoul of Google's policies (and "don't compete with Google" is not one of those policies) and the page rank demotions are explicitly documented to be because of chronic violations of such policies, then such lawsuits would be uphill battles at best.
