https://www.gamespot.com/articles/playerunknowns-battlegrounds-has-set-the-all-time-/1100-6453386/

Battlegrounds continues to set records. The uber-popular Hunger Games-like PC shooter recently reached more concurrent users than another other game in Steam history. The title reached 1,348,374 users on September 16, pushing past the 1,291,328 record that Valve's DOTA 2 reached back in March 2016.

All of these figures come from Steam Charts (via Polygon), so they may not be entirely accurate. Whatever the case, it is clear that Battlegrounds is a smash hit. It passed 1 million peak concurrent users last week, and the game just continues to grow.