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He’s talking about Andres Freund, who uncovered the OpenSSL backdoor that was slipped into liblzma from the xz malicious maintainer. Dude saw a valgrind error and a function with a fixed runtime was taking too long and using too much CPU and reversed out and saved a major ssh backdoor from going upstream as Fedora was going to release it just days later.
Yep, Trump’s campaign figured out how to game Reddit’s algorithm. Sticky a post and essentially tell anyone in the subreddit to upvote any stickied post on any visit which would quickly drive the stickied post to the top of all quickly.