I agree with you. I have seen it time and time again on any blockchain. It wasn't Nigerians on others but Indians. I understand why someone who has nothing in their world would all of a sudden start flooding with all kinds of spam, plagiarized work, etc when they find out there are places that will pay them for content but it was often overshadowing the people from the same area that actually had something to say that was worthy of a $1 tip. The problem was/is that the scammers take off after they don't get rewarded anymore and the legitimate artists are left with their art and an uphill battle to establish themselves. I don't mean to generalize but was just using Indian people as an example. It could really be anyone who gets a taste of "free money" that hasn't had it before.
Venezuela was a good example a few years ago when their country was being decimated economically. What would buy me lunch in Canada would feed a family for a few days there. I was happy for these blockchain platforms because it actually gave us a way to help our friends that meant something. Not just sending "thoughts and prayers" but actually making it so they could survive.
I guess I'm getting off topic but it just points out the vast differences based in where we are born and raised.