Earlier quoted context omitted.
Well, in fairness, I believe the guy that got caught posting classified docs in a small private discord server would appreciate privacy, even if I myself and a lot of people almost exclusively use public servers and would prefer if they were even less private so internet search would work.
His friends passed the documents along to their friends, and they eventually got the attention of the New York Times. At that point tracing the documents back to him would probably have happened regardless of whether he used IRC or anything else. Do you have any evidence that him using a centralized platform like Discord played a role in him getting caught?
But that's not really my point, just picking a random famous example of someone who would want Discord to be private.