https://www.cnet.com/news/fortnite-dominates-gaming-industry-after-making-2b-in-2018-says-analyst/

The shooter game has made a major impact in the free-to-play market because Fortnite's battle passes -- a limited-time in-game purchase that lets players earn digital items by completing challenges -- are regularly purchased by 34 percent of Fortnite players, SuperData said. Nexon's Dungeon Fighter Online came in second with $1.5 billion in revenue. Riot Games and Tencent's League of Legends took third with $1.4 billion.

PlayerUnknown's Battlegrounds, from Bluehole, dominated the premium PC and console games market with $1.03 million in revenue, though that was much less than Fortnite and other free-to-play games. FIFA 18 took second place in the premium category with $790 million in revenue, and Grand Theft Auto V stood in the third place with $628 million in revenue.