Its to ensure you aren't just stealing stuff from somewhere else without providing proper credit; i.e. say its from ____ page and I think will ignore you.
Lots of people profiting off of others work though. So is doing a good job imo of trying to at the very least inform curators that this work is elsewhere and to be cautious of upvoting
RE: WHY CANT I SUBMIT A STORY THAT I WROTE ON ANOTHER WEBSITE WITHOUT BEING FLAGGED BY BOTS LIKE @CHEETAH ?!?