> I am simply surprised they manage to produce anything at all in such a culture, let alone a hit game.

they are lucky, largely. there are enough people who put in just enough work to keep all things happening and there is roughly (my estimate, dont hold me accountable) 50% who are just there doing nothing. you could not do this at amazon or other performance focused companies because it would be obvious after very little time that you are not pulling your weight, but since Riot does not have the same level of management, tooling and insights into employee performance they don't care. the money is flowing in, all good.