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Time to get serious with E2E encrypted messaging
(techcrunch.com)
This is a most excellent place for technology news and articles.
I would be more concerned about how phone-oriented it is. A phone's default OS is such spyware that I am not sure just what is safe from from being uploaded. And even if the person wants a more private alternative, most phones have locked bootloaders. On the other hand, Linux would run on damn near anything... But using Signal on it without a smartphone is very annoying. No way my mom would understand an Android VM or a command-line client, because the desktop client isn't feature-full and doesn't even allow registration.