The Monarch taking 12% from the estate, and the estate getting richer means there is more money going into the public domain from the estate that there has been before. This isn’t “money from the gubment” being given to the monarch. This is the monarchs businesses are doing better than they have before.
Remind me, how did they come to own that land?
Stole it, that’s how we get stuff in England, just look at our museums