[voidUpdate]

If there were community areas that were designed for painting, that would be totally fine by me. A big wall that is painted white, maybe with some ladders nearby if that doesn't violate health and safety rules, and tell people to go nuts. Though you would potentially get a lot of disagreeable content, but I suspect that they would quickly get overwritten anyway

[rib3ye]

There are many such walls or discreet hidden spots, like tunnels, where the graffiti artists paint for other artists. But painting in wide-open spots where the public can judge is just part of the culture.

Maybe I should have compared graffiti to the release of Gnutella.