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Asking for donations in Plasma
(pointieststick.com)
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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While I understand where you are coming from. That goes for a lot of projects in general. Not to mention that KDE is literally an example of the thing you are talking about. KDE has an entire ecosystem of libraries that anyone can use called kde frameworks with many examples of these libraries being used on various projects large and small outside of KDE. They don't see a dime from this either. I recall a conference on TechHut's youtube channel spotting KDE's frameworks in the wild being used by companies at the event.
And KHTML! Basically, KDE work is the foundation of the browser engines behind Chromium and Safari.