I'm going to poke at a downstream consequence here.

Lets say this catches on (in some form or another, whether in this precise implementation or not).

So assume we have a world where resources can be gated by a payment wall that agents can interact with.

I'm also assuming that world continues to have agents that are majority hosted and run by 3rd parties (ex - google/anthropic/openai/xai/etc).

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At what point can I sue these companies for obviously failing to act in my interests?

Because that's the clear next step here.

Basically - where is the fiduciary duty that I would require for a real working relationship?

Because otherwise these agents can and will prefer to access payment gated resources that have financial relationships with their operators or developers.