It's an incredible achievement - even if Fortnite's Battle Royale mode is free to download and play - and one likely fuelled by the fact it is also available for PC, PlayStation 4 and Xbox One (unlike PlayerUnknown's Battlegrounds, which has yet to launch on PS4).
"To put it in context," lead systems designer Eric Williamson told Eurogamer, "some of the folk around the office are saying hey, we could be the biggest Battle Royale game in the western world, which is crazy.
"Some people are saying we could be the biggest and best-played game [full stop] in the western world."
http://www.eurogamer.net/articles/2018-01-15-we-could-be-the-biggest-game-in-the-western-world