i'm sure there are plenty of people in nigeria who aren't scammers and don't want to be associated with scammers and have normal jobs - like making television shows.
i haven't tried either of the channels, it's not in my budget. but i've done some research on them.
both of the channels have content from multiple african countries.
telafric appears to be based in canada, from their website:
744 Wilson Avenue
african info media appears to be a paid channel, only accepting paypal for the registration transaction, but i don't know the cost. it may be pay per item and they want your paypal on file to make on demand content purchaseshttp://www.africaninfomedia.com/roku/