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Exactly this. Spammers have the technical competence to overcome any technical hurdle, so using evidence of technical competence achieves nothing.

If it were possible to charge $0.25/email for delivery, I'd be more than happy . However, I'm sure large tech firms will need to say that is "too hard to implement at scale".

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Stamp costs don't stop snail mail spam, either, unfortunately. I would be concerned if we added something like bitcoin fees to email delivery rather than curtail spam it would just further encourage grifters seeking ROI on their spam deliveries.
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What if a single email cost $0.001 cent to send, and it was paid to the recipient? For $10, you could send 10,000 emails. For recipients, every 1,000 emails they get is a dollar in their wallet. You’d need something like a blockchain for this to work because the traditional payment processors still haven’t figured out micropayments.
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