No idea why (though I suspect it is about cultural politics/influence in a game rated for kids to be able to play), but All of Latin America and the Indonesian region are not blocked.
The game is honestly REALLY good so far. Amazing graphics, great performance and a good turn based system that doesnt feel slow.
Most free VPN charge for Japan IPs, or simply dont work properly when set to Japan. So set yours to Mexico and enjoy this title as most free VPN dont chare for Mexican IP.