Bazzite is seeing an insane amount of growth right now
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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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Along with what others have said about it being a great ootb experience for anyone looking to play games. It is also immutable so you can't fuck it up too easily. And the very popular YouTube channel gamers nexus has started doing their Linux testing exclusively on bazzite. I think the latter is playing one of the biggest parts, while the previous two points are specifically why they choose bazzite.