Since I needed brief intro myself, Wikipedia says: "The initial target audience for Briar includes "activists, journalists and civil society" with plans to make the system "simple enough to help anyone keep their data safe." As the ability to function in the absence of internet infrastructure may also make the project valuable to disaster response and aid organisations, the developers are working with the Open Humani…
Well, that doesn’t sound promising at all.
You can ask any cryptographer, they will tell you to not use PGP.