In the CS:GO mod, humans purchase weapons as per normal at the beginning of the round. Different servers may have restrictions on what weapons are available (the automatic pistol is sometimes restricted), and even individual maps. At any given moment, Valve moves a staggering amount of data—40 to 80 gigabytes per second—worldwide. To maintain this, it uses roughly 200 servers in 40 countries including the United States and Russia. But…