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Why are there so many graybeards in FOSS?
(www.theregister.com)
This is a most excellent place for technology news and articles.
Tech companies spend effort on a FOSS project when either it's their main product, or when they have no choice, it's licensed under GPL and there are no BSD or Apache-licensed alternatives. Contributions are usually done by individual employees in their after-hours time, and most managers see it as directly benefitting their competition.