A developer might put a collection of re-formatted datasets online, but without an explicit license or legal notice - meaning others won't know whether they are allowed to reuse them or not.
The robots in Asimov's fiction expose complications and loopholes in the three laws, and even when the laws work, robots still have to assess situations.
And, as Judge Bridlegoose explains in Rabelais's Pantagruel, it is important to spend many hours hefting law books and unfolding documents, if you want your clients to feel reassured.