He explains it all in the video. It's complicated and some of it is due to a trial decision.
I watched it again and read the document he had on screen: https://ofac.treasury.gov/faqs/1185
Again, I don't see prohibition for Russian persons to help develop anything. It also lists examples of what is NOT prohibited:
  • A U.S. company provides Russian individuals and entities with continued access to cloud-based, free-of-charge, publicly available web applications, such as email, spreadsheet, and document applications.
  • A U.S. company provides virtual private network (VPN) services to customers in the Russian Federation.
Free contributions from professionals should be welcome...
My view is that it was a personal decision by Linus Torvalds. Read his comments: https://www.phoronix.com/news/Linus-Torvalds-Russian-Devs
"...please use whatever mush you call brains. I'm Finnish. Did you think I'd be supporting Russian aggression?"
reply