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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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I generally agree, however the Purism case (same with the PinePhone btw.) is not so much about RYF certification, but legal requirements for GSM modems. Thus as a result people are hacking the second CPU that is connected with the modem on the PinePhone, but PINE64 would not be allowed to sell phones with that hacked open firmware preinstalled.