

You look for network traffic. You might not be able to see inside the packets, but you can know when they’re sending packets, and how many. As far as I know, voice assistant systems that claim to use a secondary local circuit to detect calls are telling the truth.






The consensus so far seems to be that they don’t collect as much data as people think, partly because they can’t process all of it, and partly because educated guesses are good enough to target ads often enough.