Oh, weird (counter) example: Dune. Not a failed state per se, since at the outset, the Emperor seems to be in complete control, but still… kinda? Because the various houses are constantly at some stage of war, either hot or cold.

But the ships are not armed, and interplanetary piracy isn’t a thing. This emerges at least in part because of the Guild monopoly on FTL travel. Nobody else can fold space, and nobody will risk a Guild boycott by risking harm to one of their ships. Hm, maybe a bad example generally, since I can’t think of any substantial civilian-owned infrastructure in that setting; everything is owned by a House, and thus quasi-governmental.