Make a commitment to forbid lethal use of this service and I'll subscribe for backup/disaster preparedness.

It would be a huge selling point over the competition which is allegedly being used in terroristic attacks.

Algorithm: one (or a group of) terminals reaches altitude headed from one warring region to another. Disable its transit data, keep watching telemetry. A single modest modern CPU could process the data stream from millions of devices, though it probably makes sense to have a coprocessor at each downlink location, with minimum handoff data near hextile boundaries.