"Off" or "powered down" is a lie. Those things are always on. Even the dumb old TVs with a clicker were partially and listening for the clicker's commands. It's not as though you can flip a switch and kill it. If you can talk to the gizmo (TV or the remote), it's a safe bet that somebody else can listen in.
That smart TV, the voice-operated gizmos and "hey-Siri" type features means that you have a microphone in your home, if not a camera. Anyone who has the technical chops to do so can watch and listen in. That technology will filter down from the Feds to local government. And given the level of political corruption in some local governments, don't be surprised if a few years from now, there's not a scandal about the mayor of West Sheepdip monitoring his political enemies.
Update: Roberta observed something interesting:
Depending on who you talk to and when, WikiLeaks and Julian Assange are brave heroes or tools of the Russians. Me, I think a little of both, plus a lot of self-inflated bravado propped up by wanna-be idealists who feed 'em leads and data-dumps. Does Uncle Vlad really run 'em? I don't know -- but I'll bet they make him laugh. And somehow they never take a leak in his pool.___________________________
 Though, back in the day, there was a switch on the back of the set where you could disable the clicker.
 The Stasi would have loved this modern age. They could have saved a boatload of Marks from not having to pay so many snitches.