[quote=@AwesomeZero5]
Just curious, what caused Rule #5 to come about? Since it is called a 'new' rule it sounds like something rather pushed it to occur. Although seeing as it is mentioning of humans existing in a universe rather than a world, it doesn't seem to be particularly a problem.. 
[/quote]

Ah, it's to keep theme; basically, the Multiverse sprang from Earth being split into multiple timelines, but some players in another site wanted completely original settings, aka ones not Earth. So the rule was made to allow further leeway in making settings, but at the same time to keep the idea that humans are the cause of the Multiverse's existence.