for a rough assessment of this, we might compare it to the situation with Apple maps.

In 2015, it was reported that "Apple ... receives 5 billion requests per week for its mapping services and that Apple Maps is used 3.5 times more frequently than ... Google Maps."

http://fortune.com/2015/06/16/apple-google-maps-ios/

and iOS users are the wealthy layer of the mobile marketplace. they're the cream. google doesn't want to lose them.