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Amazon Building its Own Linux-Based OS to Replace Android
(www.omgubuntu.co.uk)
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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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Amazon using Linux isn't the concern. What OP was referring to are things like their use of Elasticsearch. It's basically Amazon's version of embrace, extend, extinguish. It got so bad, that the devs of Elasticsearch changed their licensing as a way to fight against Amazon's tactics.
https://www.elastic.co/blog/why-license-change-aws
Open source is great. But when other companies take the open source code as their own to the detriment to the original open source devs, that's not sustainable. That behaviour will kill open source.