It sounds like a fee to me. That is the price that Google asks for admission to its services -- access to the data that you transfer whilst using Google service

It sounds like a fee to me. That is the price that Google asks for admission to its services -- access to the data that you transfer whilst using Google services. Monetary fees are also contractually specified. I'm not sure why you think that just because the "fee" is non-monetary that you have to transfer all ownership rights in whole, instead of those defined as the price of entry in the contracts agreed to upon account registration.