Chromium Legacy is an up-to-date fork of Chromium which supports back to Mac OS X 10.7 Lion (from 2011). On Friday, the developer's Github account and all of his repositories suddenly disappeared. The links now return 404 errors.

https://github.com/blueboxd/

https://github.com/blueboxd/chromium-legacy

Today, the same thing happened to Supermium, an equivalent project for Windows which supports back to XP. To my knowledge, the developers of Chromium Legacy and Supermium are wholly unaffiliated.

https://github.com/win32ss/

https://github.com/win32ss/supermium

Does anyone happen to know what the heck is going on? It's a little scary and makes me not want to trust GitHub. I don't see anything relevant in GitHub's repository of DMCA notices[1], and I'm having trouble coming up with legal grounds on which such a takedown could happen.

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1: https://github.com/github/dmca