I know what the Privacy Commissioner shared back. However, the reason we both raised.... The privacy commissioners all had the concern with the app being mandatory, rather than voluntary. That came from the Privacy Commissioner, because there's no one else in the government who has a mandate to look at the application of the technology.
In this situation, when we're talking about trust and people's concerns, we need to break out of the privacy paradigm and into the question of appropriate use and ethics.