The media should stop pretending they're lawyers. IANAL either but I was a pro photographer and I know there can be no FaceApp nor Facebook without you granting them rights to use your photos. If you refuse to grant them the right to use your photos: you get no FaceApp or Facebook because you'll sue them if they do whatever with your photos (which is normal). No right to publish your photos? they can't post it to Facebook without you giving them the right to it. No perpetual rights? you could sue them after 2 years for using your photos all that time, because they're still on Facebook.
Of course they need you to give them these rights. And no, they won't do bad things with your photos. Despite "owning" billions of photos, Facebook is still selling ads, not your photos.