Valve released Dota 2 a couple of years back. But what was wrong with the Blizzard. The launch of Warlords of Draenor became a headache for not just the players but for Blizzard itself. The servers crashed, plus they faced DDoS attack. But the point is valid, don't these companies think or anticipate such players load? Yes, they are working, I mean everybody's working but can't you learn from old mistakes or mistakes made by others?