Amusingly, Minecraft is a counter-example. It has very few assets and they are hardly essential to the experience.
I started playing Minecraft again recently and while it sounds like it’s the same artist, and it’s still somewhat contemplative, it’s not dissonant anymore.
https://www.loc.gov/static/programs/national-recording-prese...
I turn it off but only because I have great difficulty with multiple sound sources at the same time. I will happily listen to C418's output for hours whilst doing something else.
(And also Touhou because who doesn't love an electric trumpet?)
OSS would probably also just mean "read the source e.g. on github", not really specific as to all the four essential freedoms.