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5 years ago Valve released Proton forever changing Linux gaming
(www.gamingonlinux.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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Not to belittle their work, but the majority of stuff that made up proton wasn't theirs back then (basically wine+dxvk did the heavy lifting). They owned up to it in the end, paying driver developers and hiring dxvk authors and if I'm not mistaken also fund some wine work. A rather successful open source story but they aren't the initial driving force.