It is a really weird situation to ban users because of their Geo location and i doubt whether it is imposed by sanctions imposed on Iran by other countries and if this is another restriction i wont be surprised but the sad thing is that bitcoin is meant to remove all these restrictions and yet these central service providers are restricting these users because of their location is really pathetic. I am not sure whether they have other options to trade bitcoin but they can relay on P2P based systems or they can built one for the traders.