Everyone has to begin somewhere; most begin with the Ghost Shooter tutorial that is supplied to them. As part of the learning process, they create a GS clone and experiment with it - different sprites, actions etc.
While just altering another game (demo), altering it slightly and then showing it off as your own is FROWNED upon, we should realize that the start of learning process is imitation. If we burn them for cloning, we risk discouraging them from Construct or game development altogether.
But I agree, GS clones do not belong to 'Your Creations'. It is not a creation, it is an alteration, a schoolwork taken home. Give 'em their own section, say 'Beginner stuff' and just stick the junk in there. Or name it 'Demos' or whatever. Actually, split the creations forum into categories: demos (proof of concept, simple demos, GS clones), games (actual playable games), utilities (zomg 3dmesh tool) etc.?