Why is that probably? What makes it probable?
Big orgs have lots of people just working on Linux full time. They start out fixing one small thing, which then needs to be updated, optimized etc etc and then things snowball.
Intel 10,833 13.1%
none 6,819 8.2%
Red Hat 5,965 7.2%
So, "none", although it's the second biggest category, only accounts for 8.2% of contributions.When I contributed to the kernel (in a rather minor way, I hasten to add), I was competent enough to get a job as a programmer but my job had nothing to do with the kernel. As far as I can remember that was typical for the people who contributed during the first five years or so. I didn't pay much attention after that.