You would be surprised about the capabilities we had in 1970-80s for spying, with way way less technology than what we have today. At this point I think privacy is just a myth, we can literally use light to listen on people by having it bounce off of their windows and interpreting it back as sound. As a side note, rich people do use windows with a vibrating feature exactly to block this old method. There's literally very little you can do if you are targeted by the government. (Except leaving the country, if possible)