https://www.pcgamer.com/rainbow-six-siege-just-hit-its-all-time-high-player-count-following-operation-chimera-update/

Rainbow Six Siege's massive Operation Chimera update is now upon us, ushering in Year 3 with two new operators and a co-op zombie mode called Oubreak, which Evan enjoyed his early look at. The effect on player numbers has been immediate: the game reached a peak concurrent player count of 176,856 on Steam today, smashing its previous best.

Its popularity has exploded in recent months. According to SteamCharts data, its peak player count is now triple what it was just six months ago and already 50,000 more than its peak during February, which is a hell of a feat for a game that's more than two years old. That data doesn't include anybody playing on Uplay, either.