As a paying customer of Github I want them to know they have my undivided support in staying strong against "the bullies".
"Bully" is rather too weak a label for the perpetrator. This attack is criminal. If carried out by a sovereign nation, perhaps an act of war. We don't allow foreign raiding parties to enter our country to loot private businesses. Neither should we treat this attack as a simple act of "bullying". GitHub should get the full support of federal law enforcement, if not the military.
Should the target be a whole nation? Or maybe enough of it to affect their ability to function? How much commerce disruption equates an act of war, even if no shots are fired?
You'd need some pretty good proof and how would you respond? With another cyber attack? Or escalate into a shooting war? Or by disconnecting the attacking country from the internet?