Maybe Lagos? Lots of people. Wealth. Corruption. Cyber-criminals.
Mumbai could be another dark horse.
Mumbai is not in Africa though?
Correct. Top of thread first mentioned looking at cities outside of Asia...though I guess technically Mumbai is in Asia.
Just technically?
I think of the Indian subcontinent differently than the rest of Asia.
That seems kind of arbitrary...if India isn't part of Asia, much of the culture in Indochina and the Malay islands is not Asian, either.
Kinshasa, Lagos, Cairo, and Johannesburg would be good candidates I think.
Yeah... I don't think Johannesburg conforms to your ideas at all.
I didn't write the top-level comment. I'm also not intimately familiar with any of these cities, so don't take my word for it.
Never been there, but Johannesburg looked pretty cyberpunk in District 9. Accordim to Neill Blomkamp, during the winter season, Johannesburg "actually looks like Chernobyl", a "nuclear apocalyptic wasteland".