The Crypto-Keepers: Apps promise to keep our conversations secret. But do they?

Well, not really. That's the germ of the story, which goes on to talk about how various US government agencies are funding various encrypted discussion apps and calling into question the idea that we should trust them, to talk about how the OS the phone runs on itself is likely unsafe from government eyes (allowing an endrun around the apps anyway), and, in general, how encrypted chat apps are a poor substitute for actually reining in government surveillance.