>>36197
This must be said first. Overwhelmingly, you need to fear the cameras you can't see. They exist. They are pervasive. If anyone is spying on you with any motivation, you'll be in view and heard from long distance and hidden nearby. In terms of privacy, strategy involved in trying to obtain privacy in the nearby physical world today is vastly more consequential.
This is a good topic. Counter-drone strategy matters. If you're defending against high-resource actors, that's a far deeper topic. Suppose you deal with low-resource actors, but ones possibly even weaponized.
Strategy outline:
1. avoidance, avoidance, avoidance; avoidance is worth endless discussion
2. detection: multiple forms of radar, sensors, motion detection
3. detected? more avoidance if possible
4. diversion
5. disruption: launching defensive drones; jammers; lasers
6. hidden traps, if you're in something of a living chess game
7. guns and shotguns; always have that backup
8. avoidance