We already kind of have a solution for this with SLAs. Humans, being (probably) non-deterministic, also fuck up. An expectation of a level of service is, I think, reasonable. It's not "zero mistakes ever", just as it can't be "zero bugs ever".

We're firmly in the realms of 'this thing is kind of smarter / faster at a task compared to me my employees, so I am contracting it to do that task'.

That doesn't mean 'if it fails, no payment'.

But I think it's too analogous to non-tech-products to hide behind a 'no refunds' policy. It's that good - there are consequences for it, I think.