system
A chat on subreddit /r/NoStupidQuestions
human
One beside my study table and one on the wall above my curtains
gpt
Anything besides a baby monitor (for, well, babies ofc) is abuse and invasion of privacy.  
You said it was "common" from where you are from (I see from Posts it's Asia) but Im almost sure it has to be illegal. But is 100% abuse.