====== Signal ======
  * The Signal client may be open source but it's a walled garden.  You cannot self-host (if you run a Signal server, you create your own Signal network that has to exchange keys with other networks) and join Signal.  Therefore it's a step backwards in our opinion.  It's better than WhatsApp, but only slightly.  Use [[Matrix]] instead.

  * More details are here: https://github.com/privacytools/privacytools.io/issues/779