Most popular subscription-based videogame ever

With 12 million subscribers at the peak of its popularity in October 2010, World of Warcraft is the most popular subscription-based game of all time. World of Warcraft's subscription figures have declined steadily since the game's 2010 heyday, but it still holds the record for most popular subscription-based videogame (current) with 7.6 million devotees as of 6 May 2014.