The FBI has been doing this for 15 years with cars and OnStar. They will do this with smart speakers once enough people have them.
https://www.forbes.com/sites/thomasbrewster/2017/01/15/polic...
https://www.forbes.com/sites/thomasbrewster/2017/01/15/polic...
> The FBI appears to have begun using a novel form of electronic surveillance in criminal investigations: remotely activating a mobile phone's microphone and using it to eavesdrop on nearby conversations.
https://www.cnet.com/news/fbi-taps-cell-phone-mic-as-eavesdr...