Not that I disagree with you on the overall direction, but I guess the question here is how easy it would be to opt out of this sort of thing in China, given the extent of their "great firewall".

At present, in Western nations, it is somewhat easy to, say, self-host certain social media platforms (from Wordpress to Mastodon) for friends and family and whatnot that could be used for more private, less advertiser-monitored social media interaction. Assuming you get buy in among your friends, this pretty much avoids issues with advertiser and employer snooping that you have on large social media sites. You can then keep your Facebooks and Twitters for your "public face" (or ditch them entirely).

I don't know if the same applies in China.