I do not have an issue or problem with anyone using things that are pre-made, I do have a problem with people pasting a stack of renders from everywhere and entering a competition with them. Some entries have used stocks, but they have used them in a creative way.
It seems that under a new host this competition is turning into a "Rules will be broken when the host see's fit to do so"
And for the record I did not state that I would ban C4D sigs or photo manipulation sigs. I have used stocks in the past.