What actually happens to people who run it down mid/troll ranked?

Before someone comments they get banned, they actually don't. I won't name the specific player but i know of someone who's inted 8 games of ranked in a row and he hasnt recieved any warning or any form of punishment. Why do people literally play league of legends to run it down mid and try to antagonize people, isnt that a sort of waste of time? Wouldnt they rather play something else? I'm not going to be one of those players that flame riot for having a bad report system but why do these people exist? why is the report system not strict on these people? Its rampant in low elo, people will literally get pleasure from running it down and watching peoples reactions. How do you even climb out of silver with these players?
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