They could've been driving Porsches, except for the D'Arcy Concession which only left Iran with 16% of the profit from oil business in their country for a few decades... followed by Britain using their military might when Iran decided that a few decades of that was enough... followed by the US supporting regime overthrows after that... and so on and so on...

Iran is the way it is because the West has been ruthlessly exploiting their resources, undermining their government, and attacking them militarily for the last 100 years.