Fortnight has an estimated 200m players, and has generated an estimated $3bn in profits

"[In] September of 2017, Fortnite’s second iteration, “Battle Royale,” hit the web, and went on to spend much of 2018 going viral. The game’s concept is pretty simple: 99 players are dropped into a virtual battleground, at which point they gather weapons and digitally fight to the death until one player is left. That player wins.
As of today, there are an estimated 200 million Fortnite players worldwide, and the game can be played on consoles, PCs and iOS and Android smartphones.
“Fortnite is everywhere because the barrier to entry is so low,” said Jeff Gerstmann, editor-in-chief of Giant Bomb, a video game review site. “It’s available everywhere. Almost anyone can play it on a phone, anywhere they can play games. By virtue of it all over the place and free to play and a very popular type of game in terms of Battle Royale stuff, it’s kind of a perfect storm. It really all came together for them in a big way.”
A big way, and a lucrative way. Epic Games, the developer behind Fortnite, has not released official figures on how much revenue or profit the game has brought in, but according to sources with knowledge of the business, it’s roughly $3 billion."

Source:  PYMNTS, 5th January 2019