I think most of the machines that could run Windows could also run OpenVMS. It’s a bit unfortunate the company behind the OS needs to make money off its licenses though.
They are in a tough spot. They have to pick between milking their legacy clients who have been running VMS workloads and don’t want to port them to anything else, and a much more risky attempt to develop a consulting ecosystem so those clients can remain on VMS indefinitely. This ecosystem would eat into their own support business at the expense of reducing incentives to migrate to different platforms.
I'll admit that "OS snob who just wants to run VMS because they once ran it on Alpha" is pretty low on the freebie list, but they didn't even say no, they just strung me along until I gave up caring.
I really wish they released it under a GPL license. Unless an event starts an adoption uptick for greenfield projects (and it'd take some time for that). I wish they had an easy way to deploy an OpenVMS instance on a cloud service the same way IBM does with their POWER and Z machines (sadly, no Linux on POWER from them).