Nigeria is a developing country,
Yes of course, like any other country in Africa.
I searched a little about Nigeria on Google but didn't find anything interesting
Frankly speaking, you have to research the Google again and ask more about the Giant of Africa(Nigeria) in terms of digital currency. Remember, garbage in, garbage out, that's what Google is, so, ensure to ask rightly and you will get the needed answers to your questions.
and there are still many people who don't know that country
Well, speak for yourself comrade, though you can ask my brothers why they love to visit the Black Nation(Nigeria) often. If you are listening to the recent WHO on covid-19 news then you will get more exposure to what extent the Nigeria country has gone so far.
I'm not sure Bitcoin will succeed there, even though there is already a Bitcoin ATM
Kindly ask Binance and remitano about Nigeria in terms of Bitcoin and cryptocurrency in general, they will feed you with the needed information. Nigeria is well known to be a country of Bitcoin and cryptocurrencies. We the youths have already taken the opportunities.