Poster said that unplugging the device made their home more peaceful. This implies that having the device on was creating a constant, albeit low-level, harm.
Yep. I think we usually underestimate the low level anxiety and adverse psychological effects of one knowing they're always being recorded/watched. Usually this only applies to being outside the home, which is bad enough imo, but bringing it into the home where you're supposed to be able to relax and have a reprieve from being surveilled cannot be good for the psyche. I would not be surprised if this (in combination with social media, and everyone always having a smart phone camera, etc) is a contributing factor in many of the psychological and societal issues people, especially younger people, are experiencing these days.
"harm" is a tricky word.