Googles not making any revenue off you directly, yet they're paying engineers to work on it. They're making money somewhere - it's off of the ads you you see while you likely use google's services.

Please note that I don't think this is a bad thing, and I love and use Google's products myself very happily. But there is a difference between Google who is collecting revenue from advertisers, and Amazon/Apple who are making their money primarily from consumers.