IBM already has an official Z emulator they could offer for free non-commercial use, if they wanted: https://www.ibm.com/us-en/marketplace/z-systems-developmen

IBM already has an official Z emulator they could offer for free non-commercial use, if they wanted: https://www.ibm.com/us-en/marketplace/z-systems-development-test-environment https://www.ibm.com/us-en/marketplace/z-systems-development-...