Seems like such a feature could help other sites (like yelp) too though: at least where I live, the "what stuff is at this location" feature of google maps show

Seems like such a feature could help other sites (like yelp) too though: at least where I live, the "what stuff is at this location" feature of google maps shows not just Google reviews, but also has appropriate links into other review services (not yelp, as they don't seem to be a player here, but other very well-known restaurant/store review sites). This is very useful for the user, as there are often many more and better quality reviews on these popular sites.