Assumed Audience: anyone who cares about the success of free and open-source software. A New Rustacean listener sent me a note lamenting the way Mozilla’s transition from IRC to Discord—i.e., from an open protocol to a proprietary service. For many advocates of free software, this is a deeply unsettling move. The kind listener who sent me an email pointed to Matrix, an open-protocol service, and noted: “perhaps the default web interface is slightly less slick, but there’s not much in ...