To start, it's great for micropayments globally. There are examples where you want an API once and not again, and you don't want to create an account or link a credit card.
Cloudflare was one of our earliest partners, and they saw a critical need for it for web scraping by AI.
My personal Website supported WebMonetization (details https://webmonetization.org ) for more than 5 years already so no need to convince me about that, I agree. I also believe one could just as easily have a funding.md with an IBAN and structured communication to make the equivalent.
Anyway that's beside the point, what I still don't get is a use case without or without AI according to the constraints I listed before.