You're not getting it: this is already happening everywhere. There is no private data on public Discord servers. Never has been.

All these researchers have done is admit to doing what many less well-meaning people and organizations are already doing on a regular basis. If that admission leads to more people realizing that public Discord servers are public, then the researchers have done everyone a service.

Blaming the researchers in this case is like blaming LockPickingLawyer for locks being pickable. The bad guys were already picking the locks before he started his channel, all he did was shine a light on just how bad most locks are.