Alright, maybe they shouldn't bother trying to get listed on there.

But the very fact that the best directory for this kind of thing that I could find, is so spartan and unmaintained, tells you a lot about how rare this combination of features is.

This[1] seems like a well maintained repo.

And thank you for the pointers, we'll try to get ourselves added here :)

[1]: https://github.com/awesome-selfhosted/awesome-selfhosted

It's a fine directory, but it's not a directory for the specific constraint we're talking about here — self-hosted services with mobile apps. It's just a list of self-hosted services — most of which don't have mobile-apps. (And the directory makes no note of whether or not any given offering has a mobile app.)