If Apple Maps would even have just linked to the web version of Yelp, I'd have been ok with it. I don't want the Yelp app, so I'd have to go to Safari, navigate to yelp, search for the business I just found in Apple Maps and then be able to see more than 3 pictures or read more than a snippet of reviews. (And even then it will prompt install of the app.)
I don't mind Yelp and find their reviews helpful but I just don't want to use their app.
Yelp forces its app worse than reddit, even though Yelp's website works perfectly fine on mobile.