LoL is the kiddy version of Smite and Paragon.

It's odd to see such a garbage game, have so many people playing it.
I mean LoL isn't actually as popular as twitch would make it seem. Riot games has been caught countless times botting on their stream.
Now however they have it built into their client. then they just let each computer run like a botnet.

Pretty smart, you can defraud advertisers based on fake statistics and make people think "this is the best game, you should play it."