The evolution is really quite fascinating. At first, the swastika and penis faction was losing since it is easier to erase than draw, but then they figured out that you could make the work of the clean up people harder by stippling their drawings, so the erase tool became less effective. In response, the erasers began to draw over the drawings and were quickly pushed back by the erase tool now used by the villains. Now it's almost balanced with both factions using the stipple technique.
It reminds me of the battles that take place in one of my drawing sites.
You can see the fight in action here (in the room one down and one right from the center, especially the first 30 seconds): https://www.youtube.com/watch?v=qIJ3XFPRsSw (a lot of swastikas and penises so beware)
I'm glad that it's somewhat self-moderating but the vandals usually have the upper hand.
