Overwatch originally had The Overwatch League (OWL), which was a pet project of notorious actiblizz CEO Bobby Kotick, who pitched it to investors as the next NBA (yes, really) and it was a really bloated overbudgeted mess (see vid below) that actively hurt the game's development despite most players not giving a fuck about it, but this also meant the average player got a livable wage, which isn't normal for esports. Shortly after the catastrophic launch of Overwatch 2 OWL was shut down and replaced with a shoestring budget version called OWCS that pays much less.
https://youtube.com/watch?v=m4KSUp0Nh18
Basically the only people who made a good living out of Overwatch esports are people like XQC who managed to use it as a launchpad to a successful independent streaming career