It's not that they don't have services available to notify people, it's just that people don't use those services. Even if they do use those services, they don't check them hourly like some may check Facebook.

Even if they hosted a mastodon instance, less people would probably see that than the services they already maintain. It's just not mainstream enough yet.

Honestly I would be happy if most of their comms where available under several Mastodon accounts I could subscribe to. No account needed even!