It's interesting how many Github counternotices (e.g., [1] [2]) seem completely justified yet link to repositories that are no longer on GitHub. I wonder what happened.

[1] in https://github.com/github/dmca/blob/master/2020/05/2020-05-0... someone forked a permissively-licensed project; the original author made the project-closed source, then issued a DMCA takedown against the fork. That's clearly bogus: you can't revoke an open source license.

[2] in https://github.com/github/dmca/blob/master/2019/11/2019-11-2... Microsoft DMCAd a project that did something with Windows local licensing keys. I can see how Microsoft would prefer that this project not exist, but I see no infringement. Not everything that a big company dislikes is an infringement of copyright.