Steam now has 90 million monthly users | PC Gamer
https://www.pcgamer.com/steam-now-has-90-million-monthly-users/
https://cdn.mos.cms.futurecdn.net/up6qFk2Wd9XTNYbXeFdiz9-650-80.jpg
Steamの昨年のMAUは9000万人、1日平均アクティブユーザー4700万人

追い付いたか
PlayStation Network Is Currently the World's Biggest Gaming Service - Push Square
http://www.pushsquare.com/news/2017/12/playstation_network_is_currently_the_worlds_biggest_gaming_service
you probably won’t be surprised to learn that the PlayStation Network is currently the largest gaming service in the world. With around 70 million monthly active users, it eclipses Steam (67 million) and Xbox Live (55 million).