https://www.gamespot.com/articles/activision-blizzard-made-4-billion-on-microtransac/1100-6456669/

Microtransactions are big business at Activision Blizzard. The company said today in an earnings report that revenue from "in-game net bookings," which include things like DLC sales, loot boxes, and in-app purchases on mobile games, reached $4 billion for 2017. During the fourth quarter alone, Activision Blizzard brought in over $1 billion for in-game net bookings. These figures represent quarterly and annual records for Activision Blizzard.

Importantly, as analyst Daniel Ahmad explained on Twitter, around $2 billion of Activision Blizzard's annual revenue from in-game net bookings came from the company's mobile subsidiary, King, which operates Candy Crush. The other $2 billion came from Activision Blizzard's console and PC efforts, along with Activision Blizzard's efforts on mobile such as Hearthstone.