Speaking of, "GTA Online" is quite popular. It's not clear exactly how popular it is, as Rockstar Games doesn't release player numbers. When we asked, representatives declined to answer.
Here's what we do know about how popular it is: Rockstar Games said in January that "GTA Online" had more players in December 2017 than any previous time. Which is to say that more and more people are playing "GTA Online" over time.
It's not surprising, either. With 100 million copies sold, that means that even if only 1% of buyers are playing "GTA Online," that's still a million people. And given Rockstar's previous comments on player growth, we can assume that it's probably much more than 1%.
We also know that it's popular enough that Rockstar keeps making major additions — and those additions aren't cheap to make.
Part of what makes "GTA Online" so alluring is it takes the open world of the offline game and turns it into a multiplayer playground. You can take on heists with friends, or go racing around San Andreas, or become a business magnate.
Better still: It costs nothing to play other than the initial price of the game. There are virtual items and bonuses you can buy within "GTA Online," but it's otherwise an infinite extension of an already massive open-world game.