Those authors presumably work at places that pay GitHub non-zero sums of money. For instance, many of them are Googlers and Facebookers. I have no idea how ma

Those authors presumably work at places that pay GitHub non-zero sums of money. For instance, many of them are Googlers and Facebookers. I have no idea how many private repos those orgs have, but I have a feeling large companies with a significant open-source footprint (like the ones represented on that list) tend to buy the biggest plans GitHub sells.