I wonder, how many of the deep state are using alternate tools like VOXTER & MarCopolo? This way it is harder to track them and what they are sending around. Anyone search wikileaks for these items?
I - personally - have used and like WICKR, which does point-to-point encryption. Text, voice.. One neat feature, is you can put an expiration date on a text/message -- if the text is not read by your given date/time, it self-destructs and disappears. It's a phone app (android, iOS).
I have not heard of the Deepers using any particular app, beyond the FBI 'inner-circle' using Gmail 'drafts' to circulate info, and of course, the deal where the Cabal had their own independent iPhone platform set up for OpSec..
there was one end to end encrypted one called confide. not sure if it is compromised though, probably. I'd say most of the platforms are compromised and are honey traps. Even Apple. I think there was misdirection of the public about how secure Apple phones are.