https://www.gamespot.com/articles/pubg-creator-says-game-could-reach-100-million-use/1100-6453163/

The success of Playerunknown's Battlegrounds has been swift and massive. Released on Steam Early Access back in March, the Hunger Games-like PC shooter has reached an astonishing 10 million copies sold since then. The game continues to sell well, and now Playerunknown himself, Brendan Greene, has said it might be possible for the title to reach League of Legends-like success when it comes to player figures.

Riot's massively popular free-to-play MOBA reached 100 million monthly players back in 2016, and Greene said this figure may not be out of reach for Battlegrounds.