The Darkness Continent was far too big. Moreover, for safety, the aboriginals stayed in places that wouldn't be easily discovered by outsiders. Therefore, even though Sun Mo had stayed in the Darkness Continent for over two years, the number of darkness seeds he had encountered was very few.
It was until he had met Li Luoran's group and come to the Constellation Academy did Sun Mo start to come into contact with a large number of the Darkness Continent's aboriginals. He also noticed, through some day-to-day details, that their production capabilities were really very backward.
To put it plainly, they were poor.