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It matters to me whether I'm talking to a human or a robot.
As for mechanisms, the concern is that no software-based approach will be able to filter bots from humans in the near future (already?). And that we'll have to resort to biomarkers and centralized database using high-touch verification, that robots have a harder time faking.
If I can't distinguish a bot from a human, I don't think I'd really care who I'm talking to. But that's easy to say now.
I also get enough human interaction in meat space. And that can't be faked (yet).
I'd certainly prefer not knowing whether the other party is human or not over knowing but at the price of living in a system where I'm KYC'ed to the last tee and all my info is catalogued by entities I hold no sway over.
What is the use case where that distinction matters enough and at the same time cannot be made using a different mechanism?