I don't follow that... posting a police officer in everyone's house is pretty much a Third and Fourth Amendment violation and not primarily constrained by finances.

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.