Advertising costs rise as a market fills up. A seller in Algeria or Morocco competing against thousands of others for the same audience watches their cost per order climb every season. Meanwhile a market next door has a fraction of the competition and the same buying behaviour.
The barrier was never demand. It was that you cannot deliver a parcel or collect cash in a country where you have no warehouse, no couriers and no bank presence.
This is the same division of labour as dropshipping, applied across a border rather than within one.
MDM Express exists to be that ground layer. Merchants across the Maghreb and Egypt sell into Libya, Iraq and Lebanon without ever leaving their own country.