You got something right! The rules are generally very strict and breaking them will usually throw you to prison (fourth moon Uqor, a wasteland really). There are many groups of inhabitants, and often they are enemies to each other. Some play weaker to survive, some like to dominate. But everyone was born with some form of wings, so they can fly. That's why they don't usually stay in one place - they migrate and their structures are thin and usually small compared to the giant natural structures such as these cloudtrees.