The VMHaus offers were actually added by the provider themselves in August 2018, they specifically selected Windows to be available. On June 2017 they wrote: "

The VMHaus offers were actually added by the provider themselves in August 2018, they specifically selected Windows to be available. On June 2017 they wrote: "Custom ISO - Use our available Windows & FreeBSD or bring your own ISO." (source: https://www.lowendtalk.com/discussion/116203/vmhaus-new-uk-location-uk-nvme-kvm-starting-at-2-70-month-10-off-recurring https://www.lowendtalk.com/discussion/116203/vmhaus-new-uk-l...) I've sent them a message to clarify. :)