I don't really think that was the case, base on the CEO statement :
Coinbase CEO Brian Armstrong attributed the outage to a "large surge of traffic" overwhelming the exchange's infrastructure. The sudden influx of users attempting to buy, sell, or trade Bitcoin overwhelmed Coinbase's servers, leading to connectivity issues for many customers.
"We are aware that some users may see a zero balance across their Coinbase accounts & may experience errors in buying or selling," Coinbase stated. "Our team is investigating this & will provide an update shortly. Your assets are safe."
Nigerians have other options already, they were using Bybit, Kucoin, Okx and some others but this three are currently the top three alternative for us, the stress involves in getting verified in coinbase is much in comparison to others and that is among the main reason Binance had more Nigerian customers than Coinbase even when they became known roughly the same time in Nigeria