The rules are in the original contest post. After we realized what people were doing we felt it was necessary to change the rules because we care about providing a fair chance for everyone more than anything else. If people are going to use bots or post a link to every new article until they win, we don't think that is fair. I understand that changing the rules after the fact reflects badly upon us and we apologize. We also admit that this particular contest was organized a bit poorly and we will brainstorm for the next one to make sure the competition is fair for everyone and to make sure the rules to make the competition fair are in place well before we post.
Again, I apologize.