Bitcoin was the first cryptocurrency. It is what also led to the existence of blockchain. So while talking about cryptocurrencies, blockchain technology, exchanges, other crypto companies, they are all the products of bitcoin because they are existing today because bitcoin existed.
If there are crypto companies in Nigeria, they will pay taxes and they will create employment and which means a good thing on the economy. Also if you invest in bitcoin and get money from it, you will take part of the profit and use it to buy something. That is also a good effect on the economy. The owners of the companies will also buy things from the money earned from the crypto services they are offering which is a good thing on the economy.
With even better regulation the benefits of cryptocurrency to the Nigerian economy will only continue to grow, alot of people are currently earning from online jobs and most of these jobs pay in crypto (this forum included) from which people can pay their bills, we have physical exchanges where people with crypto can go to sell their assets and get paid in fiat if they don't prefer online P2P, this already means that aside from the people earning online they are also people who are earning offline but still because of cryptocurrency.
Bitcoin's creation was the reason why all of these are possible today and certains lives are better off because of it, even here in Nigeria.