Sober is exclusively available on Flathub, whom published these figures in their Year In Review: https://flathub.org/en/year-in-review/2025
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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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To my knowledge, it is a recreation of the game engine, and requires the original game to run. I don't believe that is illegal.
While I think it is a recompile, you don't need the original assets, it just works. I guess it's abandonware and the original rights holders don't care?
I can tell you one thing: this would not stop Nintendo layers if it was a Nintendo game, and they would be foaming from the mouth eager to take action