Congratulations, he’s done some good things amidst the almost immeasurable harm that he has done to humanity as a whole.

Engineers did that. Zuck just saw no business advantage to keep it private. He agreed to open-source them to popularize whatever they build in Meta to make hiring engineers easier, since they already know whatever they use inside Meta

Sorry, he wrote all these? Or did he just own lots of stock in a company that hired engineers who made these things?

This is like giving Hitler a thumbs up because you saw him lean down and pet a stray dog…