I've always wondered how/why Google provide maps to any iPhone app... normally such commercial usage will cost you $10,000 (per app/website). I assume there is

I've always wondered how/why Google provide maps to any iPhone app... normally such commercial usage will cost you $10,000 (per app/website). I assume there is a commercial agreement and Apple has paid major $$$ on behalf of their developers. If Google decided to withdraw that agreement, it would leave a large whole in many iPhone apps.