And I don't know if it implements all of the architectural design choices that makes Zanzibar Zanzibar - Auth0 folks may have adopted some of them, just don't know where they are at. Folks tend to think that Zanzibar = ReBAC but that's just not the case. Case in point: many services have eventually adopted ReBAC paradigm, but that does not make them Zanzibar. Zanzibar is a design for a globally-distributed scalable authorization service. ReBAC is the easy part 😅