Bouties, literally.

I just got into a lobby with a Twitch jg. He immediately flames our support for suggesting a different adc than Garen... I muted Twitch at start to avoid catching the tilt. (10/2 so it worked perfectly)

However, apparently, the Twitch put a real money bounty on my head. At first I thought it was a joke but whether it appeared that way or not it quickly became clear it was not.

The Katarina I was vs in lane kept feeding me in an attempt to make money she probably wouldn't have gotten either way. Which lead to her tilting and flaming her teammates.

Bribing enemies or even allies, with real money, to tilt other players isn't okay.