I think a somewhat comparable scenario could be: it's reasonable to expect that Walmart should defend against most counterfeit currency on their own. But should they be expected to defend against counterfeit currency made with state-level resources, such as supernotes with the same paper, ink, printing process and security features, where there's no guarantee that any reasonable detection method will work? This is, interestingly, something that has been linked to North Korea as well (https://en.wikipedia.org/wiki/Superdollar).