Buying bitcoin in Nigeria is occurring mostly via P2P trade, and from other methods that don't involve the banking network. There is an elevated amount of shitcoin and NFT platforms pushed in Sub-Saharan Africa (e.g., from Binance, Celo, and soon Mara). So some of those have stablecoins which are used to avoid exchange rate volatility.

I don't know the breakdown as to the ratio of bitcoiners using fiat to buy bitcoin versus using a stablecoin. There's relatively few people who run a node, so their bitcoin are oftentimes kept on exchanges like Paxful, Binance, and even regional exchanges like Bitmama. Some do self-custody their bitcoin and shitcoins though. There was (maybe still is) the situation where police were seeing bitcoin / crypto wallets and confiscating those funds, which was one of the contributing factors for the ENDSARS protests a couple years ago which resulted in a violent crackdown.

One thing that is different from the West is the number of people who do not have a bank account. And when sending money person-to-person, the transaction size may be small (e.g., $5, or $2 and less even). So that's why Lightning network holds so much promise.

That outcome is becoming more and more likely. I think the only question is how and when the government responds. Zimbabwe is on like their fourth currency now in the past a decade and a half, including a period where they used USD.

But such a crisis destabilizes the nation, and there already are violent conflicts and division. So it's not that I want to see anyone's fiat holdings be destroyed, I just know that the situation is such that there is likely nothing that will stop the local currency from continuing to lose value, and whatever confidence in the currency people retain today will be completely lost over time. I'ld like to think people will adopt bitcoin, but I suspect there will be a pivot to dollars first, or maybe China, believe it or not, ends up seeing their CBDC gain traction in parts of Africa too.

It's really not possible to have even a clue what the future holds.