Shout out to HP (fka Dec) with their support for hobby use of VMS. I have a couple of VAXen (just desktop microvax, no need to get excited) that I had running 15 years ago using the hobby license, which it seems still exists : https://www.hpe.com/h41268/live/index_e.aspx?qid=24548
It definitely still exists - I used my old DECUS membership number to get a new set of license PAKs (and a link to download the install media and software kits) last week.