I suspect it's that they don't want to take the risk that not being front and center on Apple platforms could have on their business. Maybe droves Apple of user

I suspect it's that they don't want to take the risk that not being front and center on Apple platforms could have on their business. Maybe droves Apple of users would jump ship to Bing... Or maybe they would jump ship to Android if Google Maps and Waze were pulled from the App Store.