They probably did build it. It’s possible they sourced the necessary chips through intermediaries. Sanctions aren’t going to stop them from getting their hands on small batches.
Sanctions will prevent them from being able to do this at scale. They can’t source enough high end chips to really build out the infrastructure to take advantage of AI for their economy at large.
You’ve described my limited FB experience. After refusing to join FB since the 00s, I joined FB a few years ago to get better access to the Marketplace. (Craigslist has gone to shit).
I joined a few groups that interested me and then the constant political bombardment started in the more mainstream groups.
Small niche FB groups are a night and day difference compared to some of the more contemporary groups I’ve seen.
Bot algorithms definitely target large groups with lots of activity. The resulting increased activity due to algorithms just amplify it further.
I just try to stick to my smaller groups to avoid all the mess.