Toxicity.
Rather then focusing on The war on drugs Toxic chat, riot should be looking into the fact
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Trolls are everywhere, and there is literally nothing a player can do about a troll other than report them and hope to god that it sticks, you can't get your LP back. or your 20+ minutes of wasted time,
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Because the report system disproportionately targets chat related offenses, many neutral players, and even some "positive" players have resorted to muting their entire team in chat to prevent rage. which leads to more people not communicating. which leads to more toxic chat from people who have a harder time controlling themselves, due to being unable to communicate to their team
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There is no way for you to "walk away from the situation" without getting punished
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riot says "only 5% of the community is negative enough to be punished" that might be true. but only if you count inactive accounts, noncompetitive mode only players, sub 30s, and smurfs, if you're talking specifically about RANKED players. i'd venture to guess that number is MUCH higher