there’s a tiny FAQ in the readme that says

Sunshine supports more platforms and has more features overall. Moonshine is Linux-only.

Moonshine runs each streaming session in its own isolated environment, separate from your desktop. This means your host PC stays usable while you stream, and it works without an active desktop session

the isolated env thing is dope, big improvement in usability for me

Seems like this can run headless and starts it’s own compositor instead of needing you to be logged in and have a monitor.