Thailand in the top 20, with a relatively poor population is pretty impressive. That's 90% mobile gaming. It makes sense now that Gameloft is partnering with AIS to bring Blacknut cloud gaming here. It's weird, because I'm pretty sure it's all mobile games being offered through the cloud.
China and Indonesia are probably heavy on mobile gaming too. However, China banking that hard with such a large population is crazy. That's why Tencent is so damn big. They're pretty much printing money with games and Wechat.
Indonesia looks like a good place to make money too, given their population is sneaky huge. That's also a relatively poor nation, at least the average citizen.
I'm surprised Singapore isn't on there. Maybe the pricing is so ridiculously high for mobile games, that most of the gamers there stay f2p. We've compared pricing with some guys I play with some Singapore, and they're usually getting stiffed for like 20% higher prices than we get in Thailand. Brutal.
EDIT: Oh yeah, no Korea is a bit of an eye-opener. Anyone that plays freemium mobile games knows that Korean whales are monsters. I wonder if the piracy scene there balances the scales. You have crazy whales, but a bunch of freeloaders who never pay for anything.