I was confused if this was something from the real Comcast, so it seems to be a clear case of trademark infringement (but it's not my call, and I may be wrong).
If GitHub agrees, then it would be a violation of their Terms of Service [1], section A.8:
"You may not use the Service for any illegal or unauthorized purpose. You must not, in the use of the Service, violate any laws in your jurisdiction (including but not limited to copyright or trademark laws)."
If GitHub agrees, then it would be a violation of their Terms of Service [1], section A.8:
"You may not use the Service for any illegal or unauthorized purpose. You must not, in the use of the Service, violate any laws in your jurisdiction (including but not limited to copyright or trademark laws)."
[1] https://help.github.com/articles/github-terms-of-service/