Even though it's been around since 2012, the popularity of Counter-Strike: Global Offensive continues as it today hit a new all-time high for players online.
Not too surprising though, since it went free to play back in 2018 which gave it quite a big boost along with the Danger Zone game mode. The previous player record for CS:GO (according to SteamDB) was set in 2016 at 850,485 with the latest peak hitting 876,575 a few hours ago. It's not a big jump from the previous record but for a game of this age it's still quite impressive.
Why is it hitting new highs? It could be popularity in China, the continuing growth of Steam itself or the recent new Operation Shattered Web which gave CS:GO a Battle Pass system with weekly missions (which is quite fun!). Perhaps even due to the recent news of Valve working to reduce toxic behaviour? More people may return in the hopes of it being more fun.
Play Counter-Strike: Global Offensive free on Steam.
Recently on Linux I had a problem with CS:GO, where it would crash on launch constantly. Sometimes it would suddenly work but it was a hassle. If you have the issue too, try unplugging any gamepads or add "-nojoy" as a launch option which has seemed to fix it for me.