Historically, macOS Server allowed virtualization on Apple hardware only. Today, even Apple’s own virtualization framework (introduced in macOS Ventura) requires the host to be a Mac.
The honest solution. A 2018 Mac Mini (Intel) runs VMware Fusion or Parallels perfectly, allowing you to run 5+ macOS VMs legally. mac os vmware image
Once you have a stable image, what can you actually do with it? Reboot your host PC
Run Docker Desktop or Linux VMs inside your macOS VM? Add: Once you have a stable image, what can
vhv.enable = "TRUE"
(Only works on Intel hosts with VT-x and EPT.)