Linux development report

I came across this report by way of this article in Ars Technica. It brought to mind the paper I wrote with a student a decade ago or so where we looked at who was developing 10BaseT standards and who was profiting from them (i.e., free ridership) which was published in the now-defunct ACM StandardView.

There are lots of interesting data in this report if you're interested in studying FLOSS (eg. Linux). Apropos the free ridership article was this graph that I extracted from Table 10 of the report.
It is interesting that the largest single class of contributors are those claiming no commercial affiliation, hence people who don't directly profit from their effort. The graph does seem to exhibit a "long tail" character ...