"Apple's and Microsoft's business transactions(except for Bing) are upfront. You pay us this much money and you get this service. Google's is a more subtle "use this free service and we'll track your behavior and try to profit off it, if not we'll kill it"."

Because upgrades, support incidents, and software assurance are free, and they will give me the manpower to run it all? Where do I sign up? :)