Not OP, but:

• Not indexable (can’t use web search engines on its content, not even forums);
• Like Deep Rock Galactic, Discord is full of cave-dwelling creatures that abduct miners;
• The built-in search feature (the only way you can search things on it, mind you) has less filters than my uncle at thanksgiving;
• @everyone
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• Can’t mute the entire server because you want notifications for mentions on a few specific channels;
• Said server creates a new channel;
• @everyone
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• Can’t use browser bookmarks to manage and enter servers, you have to use THIS fucking thing
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  • “but they have to pay for uptime somehow”
    confirmsharing, plus they got the monopoly on this type of social services by undermining their competition through venture capital so they could go under tomorrow for all I care
• Irrelevant for most people, but the garbage uncollapsible UI makes it painful to make it share screenspace with other windows on a FHD screen (which is a tragedy for tiling WM users);
• The markdown implementation is a bit janky IME
• "By reading the first 9 words of this notice you accept that you may not sue us and have to arbitrate your disputes"
• Third-party clients are against TOS, as you noted below