And when it comes to online behavior: 1. governments do monitor citizen's words online, like in QQ groups (something like slack / discord). 2. In most circumstances, complaining too much or even curse the country will not be punished, only those who take action in reality will be sent to prison, e.g. organizing demonstrations. 3. But discussing about things like how to build a bomb will lead to a conversation between you and the police.
I know these because I have experienced all these kinds of things in China. However, most (at least 80% of my acquaintance) do NOT care about this and support these policies. (To be honest, I personally also do not care about this kind of policy —— as long as the government does not raise taxes, I and most chinese do not care where the tax goes.)