@Evangeline, do we know that to be true? Source?Apple built Apple Maps because Google wanted too much user information (live location data) in return for using the Google Maps API on iOS. They've taken quite a bit of credibility hit for doing that as the Maps app wasn't up to scratch but they've ensured our privacy.
For those of far more skeptical, I think Apple built Maps for money. Either Google wanted a licensing fee or click fee for each use from Apple, or Apple wanted a share of click fees sent to Google that Google would not agree to. Either way, Apple decided to avoid all expenses to others and built their own. And yes, I have no proof of that at all...just another speculation, but to me makes much more sense than altruism, at least for shareholders.