A tool of the House of Saud is worried how Iran will spend its wealth

"is that Iran not use these funds in order to fund destabilisation activities, but instead use the funds to improve the wellbeing of its people.”"  Yes, they should learn from Saudi kings and princes on how to best spend the nation's wealth.  Saudi royal palaces and castles and monuments around the world are a testimony to the wise financial decisions of House of Saud.