The thing is these player communities are huge, more people have watched worlds in the past then the Super Bowl.
https://www.cnbc.com/2019/04/14/league-of-legends-gets-more-...
It doesn't make sense to focus on a game with a declining player base like CS:GO, when you have games like Fortnite, that on average have between 2.9 - 4 million people playing at any given time.