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FreeBSD Just Removed The Last Of Its GPL-Licensed Code
(hackaday.com)
This is a most excellent place for technology news and articles.
You have failed to understand the difference between idealism and practice. There are more companies that use Linux without ever contributing back than those that do. Those that do do so because it makes practical business sense to improve the upstream project they rely on. Any company that has decided they don't want to share some code just builds it in a binary module, firmware, or application to sit on top.