Youre the one that made the intellectually dishonest argument that scale is about cost and efficiency while the discussion was about scale of the surveillance.

from your point, nothing is cheaper and more efficient then mandating an app on all phones through which the governments can track everyone, and consequently whoever doesnt have it would be a criminal. it completely tracks from your argument. You may need to make the app stop tracking while theyre in the home, but thats a technicality. voila. no longer an issue according to your point