> Being at the top of Dota is easier than being at the top of Math or Chess or Go

I slightly disagree - neither Chess nor Go have nearly the millions of new players playing it obsessively as they come of age. Math is a bit different, but often times “good at math” isn’t very rewarding except as it pertains to an ancillary job, or if you’re one of the relative few who become a math major.

There’s also a major drop off over time with MOBA players - the average age is 22 or something for professionals. Eventually the reflexes get worse.