Not to excuse incompetent leadership, of which we have a lot in Nigeria. However, for more context, Nigeria allows its citizens to have domiciliary (foreign currency - USD, EUR, GBP, etc.) accounts locally. You can/could walk up to the numerous bureau de change operators (approximately 5000 licensed ones until last week - reduced to around 1000) and buy USD with your naira at whatever the real market rate was (not the official rate) and go deposit it in your dollar account. These accounts are part of the SWIFT banking network, and you can send and receive FCY globally. The crypto issue arose from P2P trading platforms manipulating the rates through ads on said platforms without any intention to honour those prices but typically set up to drive the market towards a particular price point. This began a cycle, and within a few weeks, the currency lost 40% of its value. There was a local news article about this manipulation. I don’t think any government would fold its hands in such circumstances.