I think it's because ALPS stopped making keyswitches when rubber domes completely took over the market in the early 2000s, and Cherry kept making MX switches. When the mechanical keyboard market started back up in the early 2010s, Cherry was there and ALPS wasn't. I agree it's a shame. I think we've seen clicky switches become a niche and most of the market switch to linear switches mainly because MX style clicky switches are fundamentally incapable of feeling as tactile or having as deep of a click as ALPS style switches due to how they're shaped and how the components are arranged internally. I don't blame everybody for preferring linear if "clicky" means "high pitched plasticky sound and a barely perceptible bump in the middle of the key travel". At least Matias still makes modern ALPS style switches, they're one of the best clicky options available today.