Sortition, back in some of the old greek citystates, they would simply draw lots for political offices. Essentially meaning random people get to be mod. This is meant as a way to limit corruption.
By divine graphology. Meaning that candidate mod write something with pen on paper, and a council of divinely inspired priests judge the aptitude, character, skill, and more based on the writing (not the text, the strokes themselves). This would probably lead to a society with incredibly pretty (and probably illegible) handwriting.
Anigarchy. The original founder of the instance rules absolutely, this remains possible long after their death, through shamans who are able to communicate with the souls of the dead.
Reincarnation, like the dalai lama, the same person is continually reincarnated in new bodies to continue their rule.
The method of the least willing. There is an addage about the best leaders being the ones who don't want the job. Why not turn that into the basis of your mod hunting?
Actual anarchy hive mind, no mods content removed once it gets reported enough