It's Bulgaria and what do you mean the hell? Students spend a lot of time without a teacher in the classroom so of course you need something to keep them in check, there's classroom equipment and the bags people leave there when they leave for a break, also it's definite proof for who hit who and who did what type of squabbles. The ones we have don't record sound as far as I know though I've rarely seen them being utilized... because I've never seen the kind of bullying they show in manhwa/manga in real life, in the first place, even though kids are stupid, they know that if they bully someone, even if there's no camers they'll just get ratted out and their parents will eat it from the teacher/principal and then the kid will eat it from the parent... for example if someone did that insect feeding shit they'd get expelled right away 100%