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Technically, steamOS because it’s designed to play games and it’s what the steam deck uses. That probably won’t have many other non-gaming features though, and I’ve personally never used it. In my experience, you can get most games without a hyper-aggressive anti cheat working on any Linux distro with varying degrees of effort, just a matter of having all the needed libraries installed! The more popular distros like Ubuntu, popOS, Fedora, even Arch (btw) should have a lot of helpful information out there on how to get Lutris or Steam set up.
The device wouldn’t necessarily have to be constantly streaming the audio to a central server. If it’s capable of hearing wake up words like “Ok Google” it’s capable of listening for other phrases and having onboard processing to relay back the results much more compressed. Whether or not this is common practice is another matter, and yes the algorithms are scary good even without eavesdropping.