Apple Maps has come a long way since that time it didn't know the difference between an airport and farm. Though many have chosen to swap it out for good ol' Google, it has remained the default mapping app for iOS for some time now.
Previously, Apple Maps would display Yelp reviews for hotels and restaurants. However, this recently changed as Apple partnered with Booking.com and Trip Advisor.
The question for many SEOs is: was this change for diversification, or is Apple trying to move away from Yelp?