Bitcoin trading mainstream in China, however Nigeria is not among the top 10 countries trading Bitcoin , could it be that Nigeria government have not legalize Bitcoin?why is China among the top 10, but Nigeria isn't?
Why bitcoin trading in Nigeria needs to be in top 10? Legality of bitcoin in Nigeria is still in grey area as far I know. Here is a breakdown of bitcoin adoption (not trading though).
https://blog.chainalysis.com/reports/2021-global-crypto-adoption-index
There you can see both China and Nigeria on the list.