The ”average person eats 3 spiders a year” factoid is actually just statistical error. The average person eats 0 spiders per year. Spiders Georg, who lives in a cave & eats over 10,000 each day, is an outlier and should not have been counted”
Of course, however given that there are 1.2 million repositories with makefiles, the listed average would mean that they contain 1.8 billion makefiles in total. I doubt that that’s the case.
Also, according to the page, only 59 million of all files are named “Makefile”.
I suspect that the file language recognition has major false positives for the Makefile language.