It seems like Sunshine and Moonlight are now active again, and have a release more recent then Apollo and Artemis.

On windows, is it possible to use the server at the same time as someone is remote gaming? Most virtual display solutions I found just turn the server display off.

Most of these solutions work by directly forwarding the GPU-rendered image. On Linux, Moonshine uses Wayland for headless rendering, but that approach doesn't work on Windows.

Windows requires an active user session with a connected display(physical or virtual) in order to build a desktop to render something. RDP can create a backgorund session, but on non-Server editions of Windows, you can't have a background RDP session while you are using it. It only allows one active session unless you patched the RDP service.

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