Mapping is a core function of any smartphone. Every person who has a smartphone has a need for maps. If Apple removed Maps from iOS completely, customers would start switching to other smartphones. It’s just that important.
So if you’re Apple CEO Tim Cook, you have two choices. You can either A) let your enemy Google continue to power your default Maps application, or B) you can build your own Maps app and kick Google to the curb.
This is the decision that Tim Cook and his team faced when they decided to remove Google Maps as the default mapping application for iOS. Instead, Apple decided to build its own Maps application, powered partly by data from TomTom.