It’s very simple. The US government maintains a list of sanctioned entities and companies. US citizens and businesses are not allowed to do business with these entities. Most of the removed maintainers either used their company email, or very publicly are employees of these sanctioned companies.
There’s no investigation of connections or anything complicated going on here.
Also, if you think corporations becoming effective government is some Russia specific thing, I have a bridge to sell you.
Yep, and smaller chunks are less likely to leave soggy sections from the juice leaking out.