There is a difference between "a Google Product" and "Code to which Google holds copyright". Most importantly, the latter may include all code written by any Google Employee during their employment.
Google has copyright on the code and runs the infrastructure?
Very much a Google product to me. Paid or not. Official or not.
> Terms of Service
> The Upspin website (the “Website”) is hosted by Google. By using and/or visiting the Website, you consent to be bound by Google’s general Terms of Service and Google’s general Privacy Policy.
Really a shame.