While most of us couldn't imagine having billions of dollars in profits, that doesn't take away the sting of losing $700 million that Gree CEO Yoshikazu Tanaka feels. According to this Kotaku report, over the weekend the Yomiuri Shimbun reported that the Japanese government could regulate online social games that have players paying extra money to try and win rare in-game items. The items in question are rare in-game idol cards. Players collect these cards in order to collect a whole deck. In Japan both Gree and DeNA use this reward system for their social games.