I'd speculate that it's more likely a data corruption problem. A system was overwhelmed or misconfigured led to corruption of critical configuration data, which led to propagation of such corruption to a large number of dependencies. Roblox tried to restore its data from backup, a process that was not necessarily rehearsed regularly or rigorously therefore took longer than expected. All other services would have to restore their systems in a cascaded fashion while sorting out complex dependencies and constraints, which would take days.