Listen to the announcement by Dan. They are not trying to make Voice private per se. In fact, every user must be identified in order to have an account. There will likely be some privacy between users, but the point is they are making a social site where every user is real. No bots, no fake accounts, not misrepresentation. A site where people will be accountable for what they say. This will drive real conversations and reduce the fraud and prevent manipulation/abuse of those who would post false information to sway individuals. Free speech, but authenticated to establish a backing of responsibility for truth.

That is what I got from the announcement event replay-video.