Late Soviet Union might be a similar to what you are looking for? I wasn’t alive back then, but from what I recall from reading old science magazines as a kid, there were few home computers, lots of “radio-hobbyist” stuff (DIY electronics from radio to computers), and praise for “inventor and rationalizer” for the good of the people. On paper at least. I think most interpersonal communication was over the phone or amateur radio, or even telegrams.

I don’t know much about how modern China goes about it though.

But TBF it’s very difficult to speculate about message encryption. Thinking back from my own experience, digital communication (over the internet or even SMS over cell phone networks) was not common until 90s-2000s, and encrypting them became a concern not too long ago, early 2010s I think? Before that, it was HTTP (without the S) and unencrypted AIM chats over the Jabber protocol.

My friend works for a startup that does exactly that - trains AIs on conversations and responses from a specific person (some business higher-ups) for purposes of “coaching” and “mentoring”. I don’t know how well it works.

It’s a Librem5 phone with cringe name and 100% markup, but it’s their own product nonetheless. I.e. it is not a generic Android with a custom skin and preinstalled apps like Trump Phone, Freedom Phone, or Quantum Internet box.

You can buy pretty much the same Librem5 assembled in China for ~$700. Take a look at Liberux Nexx Linux phone too (they are just staring out)

(Not sure what you’re calling racist here, appeal to “patriots”?)

Another interesting exploration is in Light of Other Days by Stephen Baxter. New technology allows creating light-passing micro-wormholes at any location (and time!), erasing privacy nearly entirely. At first, tabloids run wild with “shocking” photos of famous people, but eventually the hype dies. There are people who outright do lewd things in public (“anyone can see me at any time anyway”), some go about their life as usual, and some join secret groups who meet in the dark and use touch language for the deaf-blind.