KYC for example does stop most money laundering and financial crime. The most resourced actors like governments/ cartels often find ways around and it is a game of cat and mouse. Normal citizens don't really stand a chance to get around most of them.
Like it feels like your logic is that we shouldn't do background checks for employment because North Korean spy agencies get past them sometimes?
Clearly, there's no such thing as a perfect exclusion rule at any of these scales, but the false-negative to false-positive ratio seems like it will be way higher if Anthropic starts trying to verify IDs.