The ending of Atom: The Beginning is left so that further adaptation of its ongoing source material can be made; this is not the complete conclusion of the story, and knowing this context now rather sets my initial observations about the series in context (that it was taking a very laid-back and almost uninterested approach to its worldbuilding and the ethical questions raised). It is an adaptation of a small part of a longer, ongoing work. Of course it will not provide all the answers. Before moving into the meat of this consideration of the series, it is worth considering something else. I was initially perturbed, or at least surprised, to see that the series was raising and ignoring questions about machine sentience and robot ethics. It felt like a failure of science-fiction to studiously avoid taking a stand while raising allegorical and philosophical questions.
Atom The Beginning is a curious series; unlike the precedent it would appear to follow of socially-conscious updates of traditionally simplistic hero series like Gatchaman Crowds (which like it or not explored the obsolescence of superheroes and indeed government in an internet of things-based society) or Yatterman Night (which was an able if occasionally awkward exploration of the nature of villainy in a simple black-and-white morality superhero narrative) it has yet to properly dig into any of the moral issues it would appear to focus on. The precedent is there for something rich. Astro Boy was a universe that within its child-friendly framework played on ideas of the morality of android technology and machine sentience. But Atom the Beginning is set in that era in a time before the events that led to the creation of, arguably, one of the first super robots.