Unreal... I remember thinking that it must be close to peaking when it hit 6m copies sold like 2 months ago. Instead it's nearly tripled.
According to this https://en.wikipedia.org/wiki/List_of_best-selling_PC_games wikipedia page listing best-selling PC games, it has now surpassed WoW as 3rd best-selling behind Minecraft and Terraria.
PUBG could actually be in the second spot. If you click through to the sourced tweet for Terraria's sales figures it's clear the developer is referencing sales across all platforms (PC, PS4/PS3/Vita, XB1/360, Wii U/3DS, mobile). Steam Spy puts Terraria at 9.4 million sales on PC, which means PUBG has actually outsold it! On the other hand, some of these numbers are outdated (GTAV is on the list with 2 million copies sold even though Steam Spy has it closer to 8.4 million, but I understand that despite being known for accuracy Steam Spy is still just an estimate).
In any case, well deserved success for PUBG. Can't wait to play the desert map!