The idea of Transfiguring antimatter (assuming it works) is something that collectively harms all wizards if all wizards know it; it’s a group infohazard. The group infohazards seem worth distinguishing from the individual infohazards, but both seem much more worth distinguishing from secrets. Secrets exist among rational agents; individual and group infohazards only exist among causal decision theorists, humans, and other such weird creatures.
The idea of Transfiguring antimatter (assuming it works) is something that collectively harms all wizards if all wizards know it; it’s a group infohazard. The group infohazards seem worth distinguishing from the individual infohazards, but both seem much more worth distinguishing from secrets. Secrets exist among rational agents; individual and group infohazards only exist among causal decision theorists, humans, and other such weird creatures.