This should be self-explanatory.
According to
worldometerIndia's current population - 1,390,834,742
Nigeria's current population - 210,323,275
Even if the rate of crypto adoption was quite high in Nigeria, I don't think they can beat India's numbers in the near future. Population numbers play a much bigger role.
Yes, maybe in terms of population India should be very superior when compared to Nigeria, but several other determining factors such as government regulations are very important. I see that India still has a few difficulties in implementing good crypto regulations, whereas Nigeria has found it easier. From the perspective of technology itself India should also be superior seeing the number of "big tech" that is there, it's just that the rather complicated regulations make Nigeria currently superior in their adoption