Besides having the usual practice among tech companies of
storing every bit of data out of you it can get (
a) and having
more holes in its security (
1,
2,
3,
4) than Swiss cheese,
its moderators are infamously known to be coomers for literal baby animal porn (
a), to the point where they actually had to put a specific rule banning servers which had this type of porn on it in their ToS, and recently added a clause to their ToS which
waives your right to a jury trial (
a) upon signing up to the service:
Let's talk about troons. Discord, as a company, has donated to LGBT charities regularly and is openly proud of
donating to charities which "secure equity for Trans-identifying people" (
a), with both of these charities
unsurprisingly advocating (
1,
2) for "protecting trans youth" (read: grooming children).

Though I'll need to save the deep digging for another time, I am almost 100% certain that there are transgender individuals among the Discord developers and moderators, who undoubtedly are under-the-table supporting the shit Keffals and co. are doing to minors. A good thread to read about how Discord is doing basically nothing about child grooming as long as its under the right flag would be the
boykisser thread, where minors are openly stating they wish to trade nudes in DMs and little to no action is taken about it. As far as I remember, very little has been done on Discord's part about any of these servers and people despite them being consistently and repeatedly reported to them and law enforcement.
All of these things were stuff I found from more or less 30 minutes of basic Googling on a phone. Anyone who digs deeper into Discord's developers and admins I feel would uncover some absurdly horrifying things.