I would attribute most of the difference to this, but I would go further in that there just aren't that many successful international games period.
Any game which requires language for cooperation is a non-starter. So, you either have to be individually based or competition.
Most of the really successful ones are individual: Angry Birds, Candy Crush, Clash of Clans, Puzzles and Dragons.
Some competition ones do exist: Hearthstone, Clash Royale, Words with Friends. However, you have a bootstrapping issue for competition--how do you have competitions until you have competitors and vice versa?