Which is far from true. Binance choose NGN because it was easiest to do since Nigeria is open for blockchain technology and is "actively engaging in trading cryptocurrencies" but it is definetli not dominating the industry.
OP is an advocate for the growth of cryptocurrency in Africa on this forum, and I think I'll be right if i say when he meant Nigeria is dominating the industry, he didn't mean all over the world, of course it's not possible for Nigeria to be the most dominant crypto savvy nation in the world, so many nations have adopted the technology, groomed it, even before Africans bought into it.
I feel OP meant Nigeria is one of, if not the most active in cryptocurrency trading in Africa, and I think Nigeria, along with Ghana, Zimbabwe, South Africa and Botswana lead that list in Africa, so I think he's correct if he says Nigeria is dominating the industry(at least in Africa).