I think the main difference is she is mostly a billionaire via her own productivity. Everyone else on the list got there because they are capitalizing on other peoples labour, doing little to no actual work themselves.
She still reaps the benefit of other people’s work, but she is essentially still the product of her own labour.
Eh… Unless you are actually Japanese, you’re probably going to be hanging out with other ex-pats, or just very lonely.
Japan is an extremely conservative and insular country. They don’t really mind people visiting for the most part, but they don’t really think highly of people actually immigrating there.
There are ethnic Koreans who have lived in communities in Japan for hundreds of years who are still considered outsiders and are treated like second class citizens.