Tracking the genealogy of musicians https://en.wikipedia.org/wiki/List_of_music_students_by_teacher:_A_to_B
How much energy do organisms spent on their immune systems?
How many animals in a given trophic level are predators?
How many people employed in computers are black-hat attackers?
What percentage of population is cops?
If an agent technically "cooperates" but computing the conditions for cooperation is computationally intractable then the agent isn't truly cooperating
Engaged in modal combat with institutions
I operate by Crocker's rules[1].