It’s hard to tell whether or not Maxwell’s finances are part of an intelligently planned and thoughtfully engineered blueprint. I would imagine that the family inheritance / trust was constructed by a highly competent estate tax attorney.
Harvey Is quoted by Bloomberg in this fascinating article entitled: “Mystery of Ghislaine Maxwell’s Wealth Hangs Over Sex-Abuse Case” https://www.bloomberg.com/news/articles/2020-07-17/mystery-of-ghislaine-maxwell-s-wealth-looms-over-sex-abuse-case