To name a few professional that need to talk work with each others: journalists, lawyers, medical personal, security, and government. If just a small amount of the sensitive information that get transported through data brokers like facebook and google get moved to more secure end-to-end then I see a major win for projects like this. Take for example a psychologist seeking a second opinion on a recorded video of a patient, which as I understand is a rather standard practice. If I was the patient then I wish they used tools like this rather than a password protected google drive, which for practical reasons I assume many non-technical psychologist use.