Your OP is a bit misleading though - he’s not being given that money - he’s being allowed to recoup it from Crown Estates profits.
Crown Estates is due to make billions over the next few years due to the sale of seabed leases for wind farms.
The real issue is why when the % the royals recoup was renegotiated in light of the additional obscene profits that it wasn’t set at something that would give a rise similar to what other public servants are getting.
Why should they get 12% of profits when that equates to a 45% rise compared to previous years. It should’ve been set at whatever % gave them a 5% rise surely?