https://www.gamespot.com/articles/state-of-decay-2-hits-2-million-players-in-2-weeks/1100-6459385/

State of Decay 2 has reached a new player milestone. Undead Labs' Xbox One and PC open-world zombie game reached 2 million players in its first two weeks since launch on May 22, publisher Microsoft announced today. That's up from 1 million players in its first two days.

The game has not sold 2 million copies, however, as State of Decay 2 is available for free to Xbox Game Pass subscribers. Still, it's a very big number and shows that the game has found an audience despite not going over so well with critics.