Got any actual evidence for this? Yes, I remember Apple Maps; I worked on the team. Apple Maps was the result of Apple being smart and not wanting to be beholden to Google Maps forever; eventually you have to roll your own.
And yet, here we are five years later, and Google Maps is still on the iPhone, shows no evidence of leaving, and Google's iOS apps are ALL still present and better than ever, and Google is still the default search bar in Safari. Meanwhile, Apple Maps is a great product too and has been worked on and polished for several years. "Remember Apple Maps" betrays a mindset where you read one article a few hours after it was released, half a decade ago, and you have no updated impression of the product at all. Apple Maps is, in fact, rock-solid for me right now. It is, in fact, now superior to Google Maps for transit directions, and in some other ways.
So really, I'm not sure what you are talking about, at all.