There’s no way to check the whole thing, but you can totally pick a component and reverse engineer it, which is something people do quite a bit. When spying is found, it’s usually a private company doing it.
The NSA doesn’t care about your search history, but advertisers do. (and the government ever did, they’ll just call up google)
90% mass hysteria, 10% random people flying drones for fun.
Most videos I’ve seen are people misidentifying airplanes as drones, and even if they are drones… they sell those on Amazon.