If you can read Chinese, you will found that on some forums people are like talking with magic spells, in extreme cases, whole paragraph or article is composed of word/characters that pronounce same but looks different, or just looks similar enough so people understand what it implys.
Even if Chinese is my native language I can't read ciphertext of that level.
Talking about censorship, I'd like to share my 2 cents. For some time I had been actively browsing Zhihu (a Chinese knowledge sharing social platform), even posting and talking with the users. It's around a decade ago, the censorship back then was much looser. I am a Taiwanese, we even talked about a political incident which is basically Taiwanese people protesting about the ruling signing CSSTA... some Chinese agree, some do not, some just left hatred comments, but people back then was really talking and sharing opiinion. You find no more stuff like this now, the censorship got strengthened over years, a lot of topics are risky and people would rather not talk about it.