All platforms are notorious for that. Moderation is expensive, and consistent free user moderation is extremely hit or miss, mostly miss.

Unless you have enough admins dedicated to moderating every community regularly, like weekly at a bare minimum, shit will get out of hand in the places they don’t visit.

For places the size of Discord, Facebook, Reddit, Lemmy, YouTube, etc. that’s just not feasible without an army of paid moderators. User submitted reports are only useful if the users aren’t partaking, and that’s the first tier of nearly every online moderation system because few companies could even consider staffing a moderation team even remotely large enough to begin to tackle that problem.