Tom, thanks for the comment: we've disabled Typeview while we work on the privacy and user experience. We clearly didn't think that through as well as we should have. As it turns out Google search-as-you-type is actually retained for 2 weeks in full, and then whittled down after that. https://support.google.com/chrome/answer/180655?hl=en. Google probably doesn't have human review of the data though: the machines are much better for that at their scale.

There is a contextual difference beyond just UI cues too. Making a user unwittingly transmit information to you is probably at most a minor sin when the receiving end is a dumb machine that doesn't do much/anything with the data.

Making a user unwittingly transmit information to another human is a much bigger deal.