Finally, here's a more useful answer from James Bottomley: lore.kernel.org/all/Zxpqnf1M8r

The situation still looks odd when you consider that:
1. NetUP is not on the SDN list;
2. Neither is MSU;
3. None of the maintainers have personal sanctions against them;
4. While it is possible that they confused public mail.ru addresses with corporate ones, this wouldn't explain why they removed a maintainer with a personal mail server, so it still looks like a blanket ban.