I don't know if this is practically true for a lot of these countries. In a lot of these countries, a vast majority of the population doesn't have easy education, and are often poor.
Countries like India have a much better percentage (but still small) of the population that can afford the internet, that ISPs are incentivized to grow and expand. Countries like Zambia -- not so much (I don't actually know if internet.org is in Zambia). I don't know that a small business in Zambia has the capital to expand considering how many people can afford it.
