http://www.pcgamer.com/playerunknowns-battlegrounds-has-sold-more-than-20-million-copies/

Another Playerunknown's Battlegrounds milestone has gone whizzing by, and this one is a biggie. Just two months after claiming ten million copies sold—a remarkable achievement by any measure—creative director Brendan Greene said on Twitter that it has now moved past 20 million. 

The reference to frustration and change tracks back to last week's apology "for the inconvenience caused by the cheaters," and more importantly the promise to do something about it. The developers warned at the time that "our battle against cheaters will not end overnight," but said that a patch is on the way—it should actually be out later this week.