I read there basically that the complains are that hosting GreatFire in GitHub might prompt this sort of reaction from the Chinese government, or might cause them to block GitHub in China. I see no other complain, at least not in English. I don't see anything that I would read as "weaponizing all users of github". At least not in the way this attack "weaponizes" Baidu Analytics users. It seems like valid use of what's essentially a programmer-oriented social network.