I don't think in this particular case its reasonable to compare her impact on Amazons success to an heir. Jeff Bezos thought quite publicly how superior she was

I don't think in this particular case its reasonable to compare her impact on Amazons success to an heir. Jeff Bezos thought quite publicly how superior she was to other potential wives in terms of her resourcefulness which was applied both directly to Amazon in early days and later to Bezos personally. The unfairness of her unearned wealth is not that different from the cofounder or early investor who steps back and retains equity but is not involved in the day to day.