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Why You Can't Currently Download Ubuntu 23.10
(www.omgubuntu.co.uk)
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
What Google/Facebook did, while a little silly, at least makes some sense because they're segregating the product from the megacorp that owns the product. They maintain the benefits of having consistent branding while also separating out their corporate interests under a new name. In Google's case, Google still exists as a subsidiary of Alphabet, while in Facebook's case Facebook is not a separate company anymore but it still exists as just one of the platforms that Meta operates.
With X, the product itself was renamed, and in so doing the branding was destroyed. There's no good reason to do this as far as I can tell.