Well, at least the FBI is not going to share your personal information with advertisers, or (opt-in) spam you to death trying to sell you something.
The FBI's mission is reasonably clear; it's a government-regulated organization; it's non-commercial. They have a certain amount of accountability. Alas, we can't say the same for "popular iOS developers". We've seen how sneaky some iOS app developers can be with respect to privacy, and with little remorse after they get caught.