I think for now, we consider Authzed's tenancy implementation WIP. We've made changes to SpiceDB in the past that dramatically alter it and I don't really expect those kinds of changes to stop in the near-future. I do think that it'll find its way open source as some form of middleware in SpiceDB. I was actually just having a discussion with @User privately about how the dashboard built into SpiceDB might eventually need tenancy functionality to implement more advanced features.