According to Superdata, subscription revenue for WoW rose 223% in August compared to July. That figure probably means a couple of million people returned to play WoW, including from other games. We've heard anecdotal evidence of people leaving EVE to play WoW Classic. I'm not sure all games are affected, however. I started playing Final Fantasy XIV, and even after the launch of WoW Classic, I still encounter a login queue every time I go to play. The financial reporting season coming up in November should prove quite interesting.