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Valve runs its massive PC gaming ecosystem with only about 350 employees
(arstechnica.com)
This is a most excellent place for technology news and articles.
AFAIK no, and we probably never will. But we do have glimpses into it, such as this article saying Valve directly paid >100 devs to work on Linux compat:
I would imagine they still pay outside, open source devs to work on those initiatives, though maybe not as many since they've gotten past the initial push.
They just might, open source financing is good PR. 100 is a fair bit more than i thought, thanks for the source.