The problem is as they say on their website; "The project is current developed at github" and the list of contributors linked there seems to have been taken down (from the about page). I guess all of the people interested in supplying patched have github logons, and use it for issues and patches. They could switch to an email mailing list, assuming all of them also have email addresses they're happy to associate with their yt-dl work, and post patches and discussion there, but that requires setup. It oughtnt to be unsurmountable, but it presents a roadhump in development.As of now, as Linux-SWAT noted above only github sources are taken down and original ytdl website is up. I am not sure how devs will move from hereon. Probably they will keep developing and providing ytdl outside the reach of DMCA.