If you can classify houses, trees and boats, you can classify "problematic" things. That would actually be somewhat useful. In practice though, if somebody wan

If you can classify houses, trees and boats, you can classify "problematic" things. That would actually be somewhat useful. In practice though, if somebody wants to deface something, they'll find a way to do it. You can't sacrifice creativity to preventing that. /r/place has shown that people (or redditors) are cooperative enough to maintain a reasonably "clean" environment, without any form of external moderation.