Probably because somebody had the tarballs lying around, somebody else said "dude, that's so cool, you need to put them on github", and the first person grudgin

Probably because somebody had the tarballs lying around, somebody else said "dude, that's so cool, you need to put them on github", and the first person grudgingly obliged. Seems reasonable to me to defer the labor of unpacking and organizing everything to the person who thinks it's really cool, instead of the person who regrets not cleaning out their desk sooner.