Sampling bias from the fact that you're reading posts written in English, not Mandarin.

(By the way, I'm actually not as concerned with Chinese companies collecting my data as I am with American companies doing it, precisely because China doesn't have jurisdiction over me, while the US does. Similarly, I would expect Chinese people to be more afraid of Chinese data collection than they are of US data collection.)

China has sovereignty over their internet infrastructure, that's what the Great Firewall is for. The US Empire cannot do as it likes with China.

Have you been looking for opinions that the Chinese have about foreign entities collecting their data? I haven't, and generally don't, so that's why I haven't heard anything about it

Probably for the same reason I'm not concerned about Chinese companies collecting my (US) data -- what the hell are they going to do with it? I already know all the terrible things that my local/national companies and state/federal government are doing with citizens' collected data; there's real, well-known risk there. Compared to local actors, foreign ones are not nearly as incentivized to do anything with it.

Because they're probably dealing with their version of surveillance from CCP. It would be interesting to hear conversations from privacy experts and advocates over there, and share experiences of what we're all dealing with.

It's just that most people dont know. Companies collect data of everyone, yet even in America you can't say that everyone is aware of it, let alone making it seen in major media/ social media (like 小红书 you've mentioned).

Call me ignorant, but I don't think the Chinese are accustomed to complaining about anything their government doesn't tell them to complain about.