The finances of the British monarchy work like the Mafia’s Las Vegas casinos did back in the day. On the books, the assets are valuable and always do well, but the real money was in the unreported skim or, with the monarchy, in the steady accumulations of reported and unreported income — and how much that is and where it all goes, no one one on the outside ever fully gets to know.
I believe there is financial assets that they have somehow legally maneuvered off the books.
Take Joe Bidon, (please!). He has been using Hunter and his brother to hide his wealth from selling corruption. Should he retire and claim that wealth, it will be unquestionable as long as he has paid the tax upon receiving it.