Hmm, okay, it goes to an article that cites another source. The BBC? Reputable source, so here's the deal:
>Esports generated $493m (£400m) in revenue in 2016, with a global audience of about 320 million people.
So yeah, that's an aggregate of all of 2016. Let's compare it to the highest watched Super Bowl on record - Broncos vs. Seahawks: 111 million US viewers. In ONE DAY.
Yes I understand that I'm skewing pretty hard, but even the worst Super Bowl viewing in modern times pulled 39 million or so.
My point is that yeah, eSports looks like it has some numbers, but I work in a high rise building full of financially successful people that are desired marketing targets and I have little doubt barely 0.01% of them watch eSports.
Or, if I want to be a real jackass about it, I could just call eSports the equivalent of K-Pop. The numbers are there to show it's popular, sure. It's just not the target market for millions of dollars of advertising budget for US eyes.