These obscure architectures are almost always one person with a dream, one hero willing to step up make it happen and maintain it. My favorite is the openbsd luna88k https://www.openbsd.org/luna88k.html

I don't have any real clue how many openbsd luna 88k users there are in the wild, it was an obscure machine released, I think, only in japan, so most users, if they exist, are probably japanese, that is, out of my normal view scope. So as far as I can tell there is one user, the porter. But every release a couple weeks after the standard release date he comes out of the woods and drops the luna88k files and packages. I suspect it takes that long to compile on an actual luna88k. But that is all it takes and luna88k is an official hardware platform of openbsd.

I don't have nor do I really want a luna88k but that guy is sort of my hero for keeping it going like this.