I tried a little experiment in N Than one day by starting a PF fate group and announcing it. It took about 20 seconds to fill. I have party names display as hot pink and all 7 were right there at Cerulean. So anyway I left the party and started new ones 8 more times and each time ended up with different members each time within the space of around 30 minutes. All in all most members were responding to party chat comments so I'm not so sure the majority of that zone's zerg actually are bots tbh.