What will the market look like for gizmos that prevent airborne cameras from imaging your face? Or what about when small, VTOL drones are actually moving stuff around in the real world. That stuff could conceivably be your latest, packet-switched delivery from Amazon, or it could be the latest methamphetamine delivery from your drug dealer; it will be hard to tell the difference without physical inspection. Law enforcement will want to track — and almost certainly to inspect — those cargoes, and many a sender and recipient will want to thwart both tracking and inspection.

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