Comment by TheDong

Security disclosures are like telling someone they have a spot on their face. It's not always welcome, and there's no obligation on anyone to do so, nor anyone to return the favor.

In this case, the spot turned out to be a freckle, which everyone involved already knew was a freckle (since it was documented), and if anyone owes anyone anything, it's the researcher that owes github for wasting their time.