I guess you mean Internet conection costs being too high, also 3rd world countries are mostly beset with war, hunger and famine, with little or no basic infrastructure, so would be hackers would find it extremely hard becoming hackers.
Internet connection yes. Most hackers in Africa have internet access at work only where they work on custom enterprise software or general IT (non-programming) jobs and have to code hacker-interesting stuff off-line at home (if they have a computer) or evenings and weekends at work.