So, gaming this out, I don't think the person that ran SaveVideo was evil either. Assuming good faith, the most likely explanation that comes to mind is that someone fabricated a cease and desist notice.
Either that, or Reddit lost track of one of their lawyers on payroll, who got a bit too bored. (As strange as it sounds, this actually happens; I once received a C&D from Magic Leap merely for mirroring their Magic Leap developer manual to my personal site. No idea how they even found the link.)
https://www.reddit.com/r/secretsanta/comments/nw294q/sunsett...
Called it. :) It was indeed a fake takedown: https://www.reddit.com/user/SaveVideo/comments/ojohbq/update...
As a former digg refugee, I'm sorry to see the same dysfunction strike reddit.