I saw this too and immediately thought: well, they published this on GitHub which surely has a clause that grants it a license to use the code for training Copilot for Microsoft at a minimum, sooo should've published on another Git platform.

> This repository is a public mirror. All development is happening elsewhere.

So if I have code on a personal (but publicly exposed) git server with a license that includes the above quoted terms, and someone decides they want to be helpful and publish a public read-only mirror of my code to GitHub, then they’re allowed to accept that license on my behalf? I never did a thing and yet I’m now in a contract with Microsoft? How does this work legally?

Not sure GitHub has such a clause. Just looked at their terms and don't see it.