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From Wikipedia, the free encyclopedia
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.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
Why only "with sufficient revenue"? All commercial use should pay. Adding "with sufficient revenue" only makes it more difficult to enforce and introduces loopholes.
I've looked into this very briefly before and I think part of the reason is that tons of things we wouldn't necessarily call commercial usage are considered commercial usage. This was in relation to favoring the non non-commercial usage Creative Commons licenses though. (The ones they call free culture licenses.)