To me this underlines the fact that these models aren't intelligent. Like there is something like intelligence that emerges from them, which is what we see when we look at benchmarks or ask it to solve hard coding problems. But there is no mind there. It's nothing there that can learn a fundamental idea like "cheating is wrong". All it can do is get exposed to specific examples, and learn that we don't like that. So…
But cheating is not wrong when it comes to survival of the fittest, like nature in its most elemental form. Morality is very unique to humanity but not other animal forms. In nature, maybe, cheating is the norm not morality.
Animals, humans included, don't really have "morals" - they have survival instincts that result in behavior that may be viewed as moral, but whose origin is indeed survival of the fittest and millions of years of co-evolution.
e.g. Males don't typically fight to the death over territory or females, but this isn't because they have some morality code over unnecessary death - it's because death-match fighting endangers themself just as much as the other guy, and so evolution has selected against that level of uncontrolled aggression.
Evolution is also (really primarily) selecting for things that help the survival of the species, not the individual, and much of what you may think of as "morality" comes from that - avoidance of behavior that is detrimental to the social group/species, not just the individual.