Nigeria is going to become #1 for P2P Bitcoin transactions soon.
Banks have no ability to prevent crypto trading itself. This is by design.
There is going to be a shift to P2P transactions using cash as a result of the ban; which are harder to trace but also less convenient, unsuitable for large transactions, and more risky in a country which is poorly policed. A lot of people will be scammed and robbed while attempting P2P crypto transactions.
So while they won’t find everyone who has traded with cryptocurrencies, that is no comfort for those they have found.
In any case, given this direction, it is clear the Nigerian government is intent on banning use of money to trade with Bitcoin.
My argument holds.