As more folks deploy cloud-native architectures and technologies, store ever larger amounts of data, and build ever more complex software suites, the complexity required to correctly and securely authorize requests only becomes exponentially more difficult. Broken authorization now tops OWASP's Top 10 Security Risks for Web Apps. Their recommendation? Adopt an ABAC or ReBAC authorization model. This talk establishes the problems with the status quo, explains the core concepts behind ReBAC, and introduces SpiceDB, a mature and widely adopted open source ReBAC system inspired by the system internally powering Google: Zanzibar.