In practice we depend on attestation via federated login and a series of captchas for some indicator of humanness for services that are freely available to avoid significant abuse and attacks.
With captchas no longer being practical there is some need of federated attested value of a network actor?
Maybe there is a use for Blockchain after all :P to anonymously bucket human actions like buying something or device registration chain sourced from manufacturer or cell phone service provider in such a way that it has a short TTL and has to be regularly revalidated.
It need not be perfect but we are entering new territory with LLMs that can easily represent human agency short of some web of trust or signed identity mapped back to something.