I've always thought that a site or subreddit simulating the gradual creation of a legal system might be worthwhile. Call it YouBeTheJudge or something similar.

That is, each week you give the readers an incident. Details should look vaguely like Mock Trial, They render judgement, guided only by their own morality. Initially nothing constrains the court, thereafter it is limited only by the precedent that it has established.

Spin off new world any time one world gets too far into the weeds, maybe they are nations and you can do international incidents eventually?

Seems like it might be popular enough to sell to someone eventually. Long shot, but then I'd never have predicted that Epic Rap Battles of History would have succeeded.