I'd be shocked if most people in Nigeria even have a personal computer and reliable internet. That's how impoverished most of them are.
I did a little research on this for a job last year and internet access/mobile phone ownership numbers are far higher than I expected. Mobile payments are already a very common form of transaction in Africa. The Gates Foundation mentioned that one of the big issues with their current infrastructure is middle-men fees when talking about remittances between African countries through to mobile credit, so crypto is actually a strong candidate to improve that area too.
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.
Answer: "While Nigeria's mobile penetration rate is lower than developed markets, it is higher than the average across sub-Saharan Africa, standing at around 50% as of 2018, and estimated to rise to 130 million or about 60%-65% of the total population by 2025."
Also: Absence of evidence is not evidence of absence. Which, in this case, is to say that it may be that "there is no real proof that this has brought mostly normal people in nigeria out of poverty." But did you RTFA? It talks about how crypto is helping normal people. So there isn't evidence against this idea either. Maybe we should try to find out, rather than be dismissive.