But for them there are better alternatives to BTC, one being BCH for example
It isn't necessarily "Africa" or "Americas".
The heuristic is "is my local fiat shitcoin stealing my purchasing power".
Counter to your claim and easily provable with a basic search Nigeria is one of, if not the leading in BTC adoption %.
https://www.msn.com/en-us/money/news/nigeria-is-the-second-l...
https://www.statista.com/statistics/1194735/bitcoin-online-s...
Here is an interesting article:
https://www.washingtonpost.com/world/the_americas/venezuelas...