Hosting companies, grocery stores, and landlords only accept money as payment. That is the main reason. Google already does what you are hinting at: they give

Hosting companies, grocery stores, and landlords only accept money as payment. That is the main reason. Google already does what you are hinting at: they give away free services and then harvest the input from that usage to make their services better. However, at the end of the day, Google has significant expensive that need to be paid in "real" money.