She drove him to work for years (supposedly). They were a family so shared assets is only fare but not just that the last thing we need are to throw women out on the street, penniless if they divorce their spouse.They got married before Amazon was a thing and I'm going to guess she supported the growth of their business in many ways, as well as having 3 kids with him and adopting another with him. Marriage is a partnership and she's entitled to her half in my eyes. In the same way she'd have been entitled to half of fuck all had Amazon failed. Shared risk, shared rewards.
Not an issue here as she seems to have a career but writing doesn’t make as much as a multi-billion dollar global corporation.