One plausible reason: the story is a "slow burn" story that hasn't had time to gain traction. Mainstream news acts more like an aggregator of information that percolates out of various niche segments' echo chambers: give it time.

Another thing to consider: what is particularly newsworthy about it to the general public? Software technology focused people would find this very news worthy. I have little sympathy for a business of any size that uses github as its primary repository: the most-current source should be maintained on an internal server, in my opinion, and companies that require github to be fully available to operate are doing it wrong. I mean one of the primary advantages of a distributed repo is that there is a complete history for every node that has synced with the most recent commit. There shouldn't be a strong dependence on a central repo.