Why I Hate Discord (A Manifesto) [Without Sources]
Discord is aggressively proprietary.
People ought to own their data, but Discord's architecture ensures everything gets hoovered into the mother-ship. At first, this was for nothing more than to facilitate their client-server communications model; recently, all of the hoovered data gets submitted to their AI moderation platform. (searched for sources on this but it was very hard to find anything. I remember talk about this ~c. Nov 2020, might be wrong)
I should be able to modify an interface to my tastes. Modifying Discord is explicitly against their ToS, including their interface; attempting to do so will lead to a ban. Don't like their painted whore? Prefer to chat from your bespoke terminal? GTFO, Hammer & Chisel knows what's best for We Peons.
Addenda: I find Hammer & Chisel developers and Discord admins to be disgusting. This is hearsay & personal opinion from my time hanging around the developer chats, but they all came across as nasty people. I, personally, believe many of the news reports surrounding the grooming controversies; searching "Discord admin controversy," "Discord allthefoxes controversy," "Discord cub policy," &c. turn up some relevant articles. Most of these articles are from low-quality reporting shops, but I buy in to the narrative.