However, “whale” monetization is the core driver of mobile games today. Only 4% of Candy Crush players, for example, spend on the game. And 10% of this 4% (or 0.4% of users) generate 50% of revenue. As a result, even minor adjustments in whale optimization can devastate economics. According to WSJ, CyberAgent, the developer of the Nintendo-based mobile title Dragalia Lost, “slashed its fiscal-year earnings forecast for the first time in 17 years in January due in part to the game’s disappointing performance. While player numbers for the game have grown due to an aggressive advertising campaign, revenue from each player has fallen short of projections.” An anonymous official at CyberAgent told the Journal, “Nintendo is not interested in making a large amount of revenue from a single smartphone game… If we managed the game alone, we would have made a lot more.”