Indeed, I think this is how it starts. However the filtering system does not indicate to the user if their drawing was filtered - otherwise it would turn into a

Indeed, I think this is how it starts. However the filtering system does not indicate to the user if their drawing was filtered - otherwise it would turn into a "trick the system" game - a whole different genre. So the visitor always gets the satisfaction of seeing their penis galloping on the horizon. Still, many if not most penis artists then continue to add more and more lewd drawings. So it's not just a test but some other behaviour. Coming from Hacker News, they might feel like a hacker, a rebel breaking the system. And that's fine - after all there are not many ways in a society where you can feel this way and not hurt anyone.