I would guess drones have advantages over satellites, aside from the obvious "they get lots closer" reason. An operator can control their path meandering and doubling back and sinking behind covering vegetation as needed, and they are massively cheaper, and if the telemetry signal gets jammed or natural interference there is still hope of recovering it physically and extracting images from its onboard chip. But as Dawgzilla notes, such spy craft would not have navigation lights, as these Jersey/NY/MD ones do.
OTOH, it's beginning to appear that maybe the best camouflage for a spy craft is to portray it as a law-abiding drone. The latter perception seems to confer no advantage to authorities in terms of identifying owner and purpose. Whereas a detected "dark drone" breaking the rules would at least instantly garner negative associations, as well as surely stimulating a little backbone to trace the offending object to a source that can be penalized.
Fun to speculate about spies out on acreages, retrofitting commercial drones or larger hobby drones in barns or sheds, but it might take some shotgun vigilante knocking one down before there are answers.
In the end there will probably be a far less than spectacular explanation or motive for the activity. Or not -- perhaps yet another "heightened period of public frenzy" that simply fades unsolved into obscurity. Due to no negative consequences ensuing or any that can be successfully traced back to this weeks long span.
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