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Stop Doing Discord
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Here's an old post from the Discord support forum talking about this. Not sure if Discord is still handing out bans for third-party clients, but it's definitely a possibility.
I gotcha. I think currently, you'd only get banned if they found out (which they can't currently). If the app ever becomes more invasive client side, I'm certain it would cause a ban wave (and maybe a small riot) but for now, it's not that risky.