Simple. Money. OnStar costs between $25-50 per month. Say the car lasts 15 years, that's $4500-$9000 over the life of the car, and this is all at an extremel

Simple. Money. OnStar costs between $25-50 per month. Say the car lasts 15 years, that's $4500-$9000 over the life of the car, and this is all at an extremely high profit margin. Even if some people won't buy the car if it doesn't have Carplay, it's worth it because of how profitable selling services is, because people don't do the mental math on the cost.