This is not exactly the situation in Nigeria, the government are not delisting Naira on global exchanges so that the local ones can flourish, they basically do not want Nigerians to be trading virtual currencies, even though they have not explicitly banned it.

What our government sets out to achieve is somewhat vague, earlier this year they lifted the ban on banks processing cryptocurrency transactions, and only a few months later they are requesting the same banks to block accounts that receive money from a crypto transaction, it's fast becoming a farce.