It was an option on Santa Cruz bikes for a time. You could order a ton of different finishes back in the day, anodizing being one option. I think that was when everything was still being made in the US Kenesis factory. If I recall it was actually referred to as Portland anodizing inc., or something like that.

They have a pretty heavy textured bead blast finish, so tend to look dirty. They hold up well though, just need a bunch of bike lust spray or pledge to look shiny and clean. I can't remember if you could order polished+anodized. I wouldn't be surprised, you could order all sort of weird combinations of frame/swingarm finishes.