The Democratic Republic of the Congo has the least affordable Internet access for 2019, with the cost of 1 GB of data at US$10.71 which is 25.7% (a large chunk) of the average monthly income (GNI per capita) of US$41.67. The hypothetical price of 83 cents (2% of average monthly income) buys only 80 MB worth of Internet usage in a month or 2.3MB per day.
In fact, in 30 countries out of the 99 low-to-middle-GNI countries surveyed, the price of 5GB of data cost the local consumer at least 13% of the average monthly income.
Data sources: We consider the cost of broadband access across countries based on the data published by Alliance for Affordable Internet (A4AI). This data primarily cover countries with low to middle gross national incomes (GNI). We base the 2018 GNI on the data published by the World Bank and look at the affordability of Internet access as a percentage of the cost of broadband over average monthly income per capita.