Binance is one the top leading crypto exchanges in the whole world, they're well known in providing selfless service delivery. In a situation where by they found some unsecured transactions, they will definitely suspend all the suspected accounts, because people use any opportunity to cheat, so if Binance found out this they will definitely restrict all suspicious people and do further research. I think they are capable of protecting Nigerian Binance users from froud.
I think of the same that Binance is being responsible for their actions. If they have to suspend a specific user's bases geographically, they have a reason for doing it.
Well, it's not that they're going to suspend those accounts all of the time. After finding out a solution for the security and protection of their users there, they'll eventually get back to you with a better ruling and protection.