The whole premise of this post makes no sense. He posted code on his site, that he wants other people to use, but they are forbidden from changing a single line. But he didn't want it on github, because that means that Microsoft stole it.

It is lame that someone copied it without attribution. But it is a pretty minor transgression in the grand scheme of things. Certainly no financial harm done and nothing has been taken away. You can't control bytes once they are out there. Information wants to be free.

If it bothers you that much, pay a lawyer. If it was too easy to get things taken down, it would be abused by wealthy corporations (even more), and youtube-dl would be gone for good.

If I got this upset about every perceived slight, I'd be waging battles dawn til dusk. Pick your battles, folks.