Now when you go to their site, it reads:
Repository unavailable due to DMCA takedown.
This repository is currently disabled due to a DMCA takedown notice. We have disabled public access to the repository. The notice has been publicly posted.
If you are the repository owner, and you believe that your repository was disabled as a result of mistake or misidentification, you have the right to file a counter notice and have the repository reinstated. Our help articles provide more details on our DMCA takedown policy and how to file a counter notice. If you have any questions about the process or the risks in filing a counter notice, we suggest that you consult with a lawyer.
Also at 9to5Google
[2020-10-25 01:01:09 UTC: Updated title to more accurately reflect notice was given to GitHub, not to youtube-dl. --martyb]
(Score: 3, Interesting) by Zinnia Zirconium on Saturday October 24 2020, @09:51PM
I have read the source and it's both scraping and undocumented API. Seems to break monthly in my experience.