there are some out of band issues. SMS, email, etc are "push" which means I can't stop people from sending me sensitive things unencrypted. Centralized platform

there are some out of band issues. SMS, email, etc are "push" which means I can't stop people from sending me sensitive things unencrypted. Centralized platforms like facebook, while technically opt-in, are so deeply rooted in the younger generation's lives that opting out has unacceptable social consequences for many people.