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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
It is my understanding that the only difference applies to hosted software. For example, Lemmy is AGPL. If it were GPL, then a company could take the source code, modify it and host their own version without open sourcing their modifications. AGPL extends to freedoms of GPL to users of hosted software as well.
A real example of this would be truth social which is modified Mastodon and as AGPL those modifications are required to be open source as well.