Is am surprised that Nigeria is not among bit I know Nigerians are really gambling. I changed it from gambling to online gambling and I saw Nigeria to be among. You can check it here:

https://en.tempo.co/read/1881215/11-countries-with-most-online-gambling-players-in-the-world-including-canada
https://africa.businessinsider.com/local/lifestyle/10-countries-with-the-highest-internet-gambling-population/sm1zm72

I think the betting shops are still going to be regarded as part of it.