The author made "being on github" a hard requirement. I think it might have been made as a kind of shorthand for "on github or something equivalent" but you can

The author made "being on github" a hard requirement. I think it might have been made as a kind of shorthand for "on github or something equivalent" but you can't blame someone for taking the author at their word when they state it so plainly. And that stated sentiment is pretty insane.