Nigeria has a cell phone adoption rate of around 50% currently. People can trade crypto, do banking, money transfers, etc. on a cell phone. The idea that a desktop computer is required is a very old-school mindset. Similar to your "everyone in Nigeria is impoverished" comment.
Also, it's not about getting rich. It's about surviving when the government has all power to freeze your bank accounts, inflate the currency, etc.
Also, it's not about getting rich. It's about surviving when the government has all power to freeze your bank accounts, inflate the currency, etc.