As far as I know, there isn’t anything that goes against using OSX in a VM in the EULA — so long as your host runs on Mac hardware. I don’t think you even need

As far as I know, there isn’t anything that goes against using OSX in a VM in the EULA — so long as your host runs on Mac hardware. I don’t think you even need to use OSX as the primary OS in the machine. That’s an admittedly big caveat, but also one of the reasons why virtualizing OSX works in the first place.