because a microsoft engineer was trying to diagnose unrelated performance issues and stumbled on it by accident basically.
https://www.wired.com/story/xz-backdoor-everything-you-need-to-know/
This was like mythical shit that you usually only see in ridiculous hollywood movies but for real. There's rumors a state actor may be implicated in it (most likely from China) so there's not much info about it at the moment as the NSA is trying to keep everything secret.
It says right here in Matthew 16:4 "Jesus doth not need a giant Mecha."
https://i.imgur.com/dQgC4kv.jpg