Seems that Korea's revision of their anti-gambling laws have smacked even the 'casual' games. A few days ago the country quietly blocked all microtransactions on games in Facebook, pending review by the country's Game Rating and Administration Committee.
Under the new laws, any new games and existing unreviewed games will now need to pay to have their games reviewed, waiting up to 15 days for a decision. The law called the Game Industry Promotion Act states that games must be rated by a panel of nine experts, made up of professors, attorneys and industry watchdogs. Until then the games are available to be played by residents of the country, but all levels and unlockables must be earned through playing through the game; through 'grinding' basically.
The new law comes as part of a crackdown on social casino games by Korea, games that had previously escaped being covered by the laws covering gambling in the country.