Right ... Strike only has fiat gateways in the U.S., and ... Argentina, or something like that.
But with strike you are able to send fiat not juts to Nigeria, but to Ghana, Kenya, Rwanda, and four West African CFA Franc countries (Benin, Ivory Coast, Senegal, Togo), as well as Guatemala, Mexico, Vietnam, and the Philippines.
Of course, if you already use Bitnob, Strike probably doesn't add much for you (since Strike itself is using Bitnob to deliver fiat in Africa), but Strike is invaluable for those outside of Africa needing to send to any of these eight countries.
But lets say you wanted to send to Vietnam. You could buy BTC on Bitnob, or any number of other exchange methods, send the BTC to Strike, sell it for USD, and then use that USD to send VND (dong) to anyone in Vietnam. That makes Strike even better than most global remittance organizations!!