At what point is liability the only "job" left for humans?

Depending on the scale. If you ask Clause to one-shot an app from a nebulous description, you get a prototype which you would understandably loathe to own the code of. If you plan carefully and limit the scope, you get code that you understand, can approve of, and are okay owning further down the line.

Presumably, every company that has non-LGPL CC code in production wants to own it...