https://habr.com/ru/articles/769892/

This dude tried to get modified Linux source code from a Russian vendor Digma and in email they literally replied:

"Forget about GNU and others, it's under NDA for many years and nothing builds there. Also it needs signing keys."

"Write letters to Google, Sport lotto and wherever you see fit. Scare us and hurt us. We are waiting. We won't give you anything at all."