From close to the end of the article: "some of the games we have acquired (for instance Dwarf Fortress and EVE Online) take years and millions of people to man

From close to the end of the article: "some of the games we have acquired (for instance Dwarf Fortress and EVE Online) take years and millions of people to manifest fully. To convey their experience, we will work with players and designers to create guided tours of these alternate worlds, so the visitor can begin to appreciate the extent and possibilities of the complex gameplay." (Dwarf Fortress is clearly more about the "years" than the "millions of people", mind you.)