I actually think there is a use case. IIUC you can only legally run macOS on Apple hardware. However you are allowed to run it in a VM. So it could make sense t

I actually think there is a use case. IIUC you can only legally run macOS on Apple hardware. However you are allowed to run it in a VM. So it could make sense to run Linux as the base OS then run macOS VMs on top. This would probably make it easier to manage than only running macOS as generally Linux is more suitable for headless usage and people are more familiar with running it in a server setting. Of course there are still limitations here because IIUC Apple also has restrictions about renting, so I don't think you can run 2 VMs and rent them to different customers. But you could possibly run multiple VMs for the same customer on the same hardware. Honestly I assume that they are running the "Runner" OS in a VM anyways. So really it comes down to what makes it easier to manage the host? macOS running macOS VMs or Linux running macOS VMs.