If youtube-dl is permanently removed from Github, this project will surely follow the same trajectory if it gets any bit popular. So I am not sure what's the point of this.
It's an alternative implementation, and may be useful depending on what happens with the main youtube-dl project.
Perhaps a case of "the more the merrier"?
the lesson of the day is to NOT trust a centralised authority run by microsoft.
Github isn't at fault here, nor is Microsoft. There's little they can do in the face of a DMCA takedown without opening themselves up to a _lot_ of liability. The entire point of that system is to take the hosting provider out of it.