The idea of paying for usage is actually very appealing.
People do this intuitively with payments (negative). They'll buy a timeshare or a boat (expensive, "lump" cost) when it would be much cheaper on net to stay at resorts or rent a boat and pay by usage.
They'll pay for subscriptions (automatic payments) rather than pay per experience. Many people will pay $20/mo for Netflix, watch it twice a month, but would never rent movies for $3 on Amazon.
They'll pay a big premium for "unlimited" data plans when this actually makes little sense for anyone vs. paying by usage.
There’s no reason a big host can’t be 100% free, entirely relying on user payments for requests to pay for electricity and new servers (where each request is almost free), a few engineers and security guards to physically install, maintain, and monitor the servers (funded by excess or donations).
One could easily imagine that, or that your AI provider, being ChatGPT, Anthropic or Cursor or even neo clouds where you run your own compute on, provide a weekly or monthly aggregated payment not just for computes but for paid traffic. They have the balance sheet (sigh) to front it.
You'd pay $20 for compute and $8.7896813 for traffic or you'd have a "budget" of $10 of traffic included in your $30 bundle.
I think customers would accept that if explain that otherwise their queries wouldn't be as nice and also that the providers of content would get a share.