All the users that have contributed freely, but it's not free.

I contributed and in the return I get free access to the product or advantage. I don't pay. My data worth nothing.

People who think that by paying google to get the pub get a return of money is them who is wrong. Google uses schema but all the people who pay for advertising are those who pay for the service. Not me, not people who participate for free. It is like a concert if people participate voluntarily and the concert is free it is free, even if he knows your name, your schedules. This is unnecessary data.

It's free = you are the product is with Facebook not Google.