How about instead of each newspaper creating its own system, they all just run a Mixmaster/Mixminion/Sphinx node, so that there is no single point of failure?

How about instead of each newspaper creating its own system, they all just run a Mixmaster/Mixminion/Sphinx node, so that there is no single point of failure? The problem of anonymous communication has been well-studied and we know how to make practical systems for it. I should not have to connect to a server run by Forbes in order to communicate anonymously with Forbes.