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TL;DR: Nintendo decided to do a cool thing for their game's competitive community and give the tournament winners a custom cosmetic. The winning team is these guys called "jackpot". Some time later, a large quantity of discord messages are leaked that consist of the whole team saying a whole bunch of racist shit about black people. Now, Nintendo is removing the custom banner and disqualifying Jackpot. It's currently unknown whether the runner-up team, Phantom Thief, will be given the trophies or a banner.
Yeah I agree with this. I think these people lose sight of how many people have visibility of the channels that they spout their bigotry in. From what I remember of Discord, there is a sidebar on the right which lists the people that are online. But you never get notified when a new person can see your messages even in the case of restricted channels.
It's a tough problem to solve technically but it seems like neither the people being outed not Discord cares.