Well I own Uchiha so I guess I can't be one to talk, but there are people who were hired that were outside of the guilds and were recruited. We didn't get any special treatment either. Like everyone else we had to fill out the application and show what we can do before we were accepted. You also want to hire people you can trust and that won't expose any secrets to the server or send stolen graphics. It's not limited to these guilds so don't think it's a corrupt secretive recruiting process.