@privacybro
Thank you for your question, which gives me the motivation to write, and on the other hand, I can also ask questions through my answers, so that more people can understand China. I will answer your question truthfully, and the following answer is subjective (empirical):
Q: Publicly criticize politicians (on social media)
Answer: Some parts are allowed, public criticism is allowed, but not insulting, and criticism must be accompanied by evidence and facts. But I have never seen criticism of the current top leaders and national leaders.
Q: Public protest against the government
A: According to the Constitution, citizens have the right to lobby and assemble, but it needs to be reviewed, so I don't think so.
Q: Using open source software without the latter:
A: Absolutely
Q: The exchange of goods and services without government intervention
A: Absolutely. By the way, why not?
Q: Domestic travel
A: Of course, that's your right and freedom to go wherever you want, why not.
Q: Religion
Answer: Ordinary people are allowed, but there can be no cults, and Communist Party members do not allow any religion.
Q: If caught, it will be dealt with in accordance with relevant laws. There should be very few things to compromise, and there have been many scandals exposed in the past ten years, and this phenomenon is decreasing. If you can't afford a lawyer, the state will have a free lawyer.