Many cities many EAs live in have very high living costs. Thus, even full-time working adults often do flat sharing. This is why some people have set up EA (or rationalist) group houses: they’d prefer to live with like-minded folks.
This is only partially true. There are many EAs living in group houses who could afford to live alone but prefer group houses.
I’d expect it to be harder to tell that Russia is heading towards nuclear war than that they are planning an invasion.