Having recently given Lemmy (via the Jerboa app) & kbin (via just their web app -- since that's all there is) a test drive....
Lemmy is okay, but the app is extremely glitchy right now, throwing constant "unable to convert to JSON" errors. (I'm copying this comment before I hit submit, because I've already lost one lengthy comment due to those errors) FOLLOW-UP EDIT: I was never able to submit this comment via Jerboa, so here I am posting my comment on the website.
And Kbin is mostly just broken on phones.
The interface is completely confusing and cryptic. As far as I can tell, once you navigate off the home page, there are no links back?
And after several minutes of trying to subscribe to a "magazine", I finally figured out that the button is rendered off-screen, and you have to scroll to the right to find it.