http://wccftech.com/playerunknown-shocked-battlegrounds/

PlayerUnknown, or Brendan Greene as he is known in real life, keeps riding the wave of fame at Gamescom 2017. With Battlegrounds recently breaking eight million copies sold in just four months since the debut on Steam Early Access, he was interviewed by GameReactor and said:

I’ve been shocked at the speed at which we’ve been selling copies of Battlegrounds. We’ve actually just broken 700K concurrent players on Tuesday when you least expect it!