Just found this thread. Some back story, for what it’s worth: I started badg.us on my own personal server as a demo to get support to launch badges.mozilla.org on Mozilla hardware. My intent was always to build a badge service to specifically support the Mozilla community.
But, word spread about badg.us, and many parties began using my demo - e.g. K-12 teachers, libraries, other community groups beyond Mozilla. This quickly grew into something I couldn’t support, and so I planned to shut it down. I offered the badg.us domain and database dumps to anyone interested in taking it over, and some folks on the Open Badges and Community IT teams accepted. I don’t think those Open Badge folks are actually still with Mozilla, though.
I’m not sure who that leaves as a stakeholder for badg.us. Not me, because I was going to shut it down. In a perfect world, it would be great to transition any users of that thing over to something else. But, that was not something I ever had time or interest to do.