Of course it's not one community, but overlapping communities. The Darkover con community is very different from the DragonCon community, I'm told. It's certainly different from the Chattacon community. I don't know if Darkover con has a written anti-harassment policy, but I'm sure that anybody harassing somebody would quickly have the attention of any number of gray-haired Renunciates and would either mend their ways or get an invitation to the world.

All in all, I think the anti-harassment project is a good idea. I hope it catches on.