One thought I had toyed with was a "Consortium"--sort of equivalent to the "Zoner Council". Made up of all current AI players characters.
It wouldn't control anything but act as a forum for discussion by AI of all sorts--sort of like "holy ground" in Highlander.
Again you need a singular reason that produces such unity but they could be the collective consciousness of all AI players--no authority--but a general consensus that all machines could agree is logical...maybe even serving as an Rped political body that non-AI parties could approach all AI through.