Marvel's Avengers cost Square Enix an estimated $170 to $190 million, was the best selling game in America the month it launched, and still forced a $105 million write-down. The Spider-Man swinging from thin air is the whole story of how that happens. The game shipped in September 2020 built around five heroes and one traversal idea. Iron Man flies. Thor flies. Hulk jumps. Levels were open fields and rooftops you cross by going over them, because nobody on the launch roster needed anything to…