Google doesn’t sell your data, they’re one of the few that don’t. That doesn’t mean they aren’t misusing your data though. They’re more the dragon hoarder than the thief selling off stolen goods. They want all your data so they can learn everything about you. Selling your data to others makes it worth way less. It’s a difference in strategy. Google retains the data to enhance their products, Facebook sells your data because they have no products that would be improved by keeping it.