I sure do wonder what part of Japanese society this manga might be criticizing!
Like, it's kind of funny seeing people compare this to actual authoritarian regimes when this is pretty obviously a commentary on Japan's overemphasis on social conformity, something that's especially prominent in their school system, (Hence the insane number of school sponsored events) but is perhaps more famously involved with their office culture. (Such as their practically mandatory drinking parties.)
This isn't actually about actual hard control or anything, it's about how people get shunned just for acting the slightest bit out of the ordinary. How everyone around you is constantly pressuring you to act a certain way, and how if you don't act that way, you're treated like a freak.
Manga authors (especially self-published ones) are actually kind of famous for writing about this. (Because even in Japan, it's socially unacceptable to be an "otaku" in the sense of being extremely interested in anime, manga, &c.) Super common theme in romcoms, where the otaku MC is forced to become a loner just because they were drawing manga in class once. This is just a much darker version of those themes.
Hence the manga including "state sponsored bullying." It's not about laws, it's about how people treat each other. Same for the point about the policies changing all the time, like how it can be normal to like something one day and then the next it's out of style and you're behind the times. Or the opposite, like how liking anime used to make you a weirdo, but now it's fine so long as you only watch Jujutsu Kaisen and One Piece. (Though this is a US example.)
Wonder if the author was born in North Korea
