The Central Bank of Nigeria initially prohibited banks from dealing with cryptocurrencies in early 2021, but later allowed some fintech companies to offer cryptocurrency services.
As I can remember, the federal government then only prohibited the commerical banks not to facilitate on crypto currency transactions such as the banks also serving as traders and vendors. The Fintech companies were only authorized to facilitate investors crypto trading such as exchange of assets to naira.
Sounds like you're not updated Op because expectedly, you should have also talked about the recent prohibition of the Fintech companies not to associate with the cryptocurrencies furthermore.
However, there have been instances of fraud and scams involving cryptocurrencies in Nigeria, so caution is recommended.
The federal government has never accounted any form of persons who had involved in fraud using the cryptocurrencies as a route. Our government is only acting anti because they knows how well the masses are achieving through the crypto markets.