Comment by Pxl_Buzzard

This appears to be a move to meet package managers halfway. Yes, tools like npm and go have great integration with git repositories, but others like NuGet still require a hosting source. Long-term, you could imagine package managers forgoing their own hosting services in favor of letting GitHub be the primary host who takes on the issues of bandwidth, availability, access controls, etc. It's another vector for GitHub to compete in FOSS.