At the moment the number of users who have played Overwatch, exceeded 30 000 000. The announcement appeared in the official Twitter of the game.
We are talking about all accounts created since the release of the project. That is, it is not necessarily that we have bought 30 million copies of the game. A registered account zapisali during free periods. Someone also bought the game again because of the account blocking.
In October 2016 Blizzard announces 20 million users in late January, the figure rose to 25 million.