[jrochkind1]

i would say that went away because the rubygems ecosystem (including the invention of bundler) improved enough that there was really no reason to use github as your rubygem server. It didn't give you anything but a slightly confusing proprietary alternative with no added value. So people rightly stopped using it, and it rightly went away.

It's not clear to me what the value added for ruby specifically is now. (Yes, I know rubygems.org has problems; but this has feature problems with indirect dependencies compared to rubygems.org hosting).