> pure sloppiness on the part of github

Considering that their entire business model from the start has been "capturing the open-source ecosystem onto a closed and proprietary platform that doesn't interoperate", I'm more inclined to assume malice here than 'sloppiness'.

Edit: By which I mean that their approach most likely just couldn't work well enough for end users, in terms of hassle, if they actually did it above board and included licensing information. So not caring about that was the profitable option.