https://en.wikipedia.org/wiki/Max_Headroom_(TV_series)#Plot
Would it be outlandish for the tech industry to lobby that Smart TVs and computers be given a 911 style emergency calling system, then for emergency dispatchers to have access to surveillance information, then for such devices to be required to be turned on all the time?
“Winston turned a switch and the voice sank somewhat, though the words were still distinguishable. The instrument (the telescreen, it was called) could be dimmed, but there was no way of shutting it off completely. [...] Any sound that Winston made, above the level of a very low whisper, would be picked up by it.”
Try this: Switch TV to standby then turn on. Time how long this takes. Unplug TV for 30 seconds plug in and then turn on. It will take a while for the TV to boot from cold start.
Manufacturers have been doing this since CRTs.