If everyone on earth is being monitored by the FBI there would have to be like 5 FBI agents for every person on earth. Why 5? A FBI agent can’t work 24 hours a day. 3 FBI agents working in 8 hour shifts. The 4th one? The FBI agents probably want to go on vacation some time. The fifth one? The FBI agents probably still want their weekends. So there are either 35 billion people living hidden from us or we don’t have our personal FBI agent.