It’s still the same principle. Keep the cost of your product low and make money to supplement the product.
No, it's not. Kodak sold film to the people the sold cameras to.
Google sells ads to multiple third parties, not (except incidentally) to the people who they sell/give Android to. Google also sells information to third parties about their other clients. Kodak never did such a thing.
Google wants a backdoor into everyone's private information to get that information. Android provides that door.