They actually did so very early. In early 2009 they added Git, Hg and Bzr support: https://arstechnica.com/information-technology/2009/03/sourceforge-adds-supp

They actually did so very early. In early 2009 they added Git, Hg and Bzr support: https://arstechnica.com/information-technology/2009/03/sourceforge-adds-support-for-new-version-control-systems/ https://arstechnica.com/information-technology/2009/03/sourc... That's less than a year after GitHub launched and was still very small.