With google you are the product whether you pay or not. Some of their most valuable data comes from the companies who use google for all of their email, calendar and documents.
I'd argue it's the least valuable data. They can't look at it, they have regulatory, legal and contractual commitments to protect it, they have paying customers that will be very angry if it's lost or unavailable, and yet they can't mine it or train models with it or monetize it.
