Poor African people. Scammers must have known how those countries like Nigeria who don't like updating their windows version with the latest ones.
I'd guess that most Nigerians don't update because they bought their copy of windows on a CD from a peddler.
People who are earning less than $10 a day, are not able to afford legit software, that's the beauty of this world
On the other hand in those poor countries most hardware is outdated and won't be able to contribute a lot of mining power, even if it gets infected.