It might be neither easy nor impossible. You could imagine s reputation system that depended on what others thought of you. Start the network with just people t

It might be neither easy nor impossible. You could imagine s reputation system that depended on what others thought of you. Start the network with just people the developers know personally. Admit new people when enough existing members couch for them. Sometimes fake cancers will appear, but they'll sometimes get sniffed out, and the people who let them in punished somehow (temporarily blocked? Delete photos at random? Idk) strictly enough that people generally don't want to let in bad actors.