All good points. A small note though I believe the Queen started paying taxes in exchange for the state’s help rebuilding Windsor caste after the 92 fire. So seems more quid pro quo than something she felt was the right thing to do.
Still didn’t pay inheritance tax on her personal wealth though
There are also all the laws the monarch / monarch’s lawyers interfered with e.g. police can’t enter Sandringham Estate without an invite, leaseholders on the Duchy of Cornwall are excluded from buying their freehold
https://en.m.wikipedia.org/wiki/1992_Windsor_Castle_fire