I can't help, but assume current Nigerian government really don't like cryptocurrency. After all, government usually encourage people to use their currency. I also doubt cryptocurrency P2P exchange alone could have big impact on local currency rate. Maybe there's something i missed or don't know here.
Big impact no but they can have one, basically the population is buying a foreign asset, much like Germany was buying $ to pay their debt, with every single BTC and USDT Nigerians buy thee is less demand for Niara and more demand for USD!
The reasoning is sound, the actual effects are speculative but here is where crypto lovers actually shoot themselves in the foot, because you can't claim 20-30% of the population is using crypto and at the same time say that a foreign currency owned and desired by 1/3 of the population has no effect on the exchange rates!
Does this mean that laws are passed but not strictly enforced?
It's always the same, you can have a radical ban but nobody cares to enforce it or you can have a limited ban on things and every government agency is out for it, here is a soft ban on naira listening, as long as you don't deal with their currency you can offer your services to every citizen.
So, little to no impact overall even if thoroughly enforced.