Cool experiment, very disappointing outcome. To me it was an experiment in dynamic, ever-changing art; giving way to creation and destruction. In the end, it was just scripted bots working to preserve art, mostly corporate logos and national flags. Why was there no captcha?!
Interesting philosophical contrast between this, your suggestion, and http://www.milliondollarhomepage.com - anarchy vs benevolent dictatorship vs capitalism.
The bots thing definitely leaves a bitter aftertaste to the whole experiment. I still loved it and enjoyed watching things unfold, though. As for the logos/flags thing.. I think that had more to do with how short the experiment was. Maybe if it went on for a little longer, people would have been slightly more creative. As it stands, even the more creative stuff was very meme-y. Megaman shooting dat boi, for example.