There was a short period of time when the app entry in the Play Store mentioned that it was no longer being developed. I guess for many this seemed to be a reason to look for an alternative. It’s definitely still being developed because the app has been completely rewritten and is currently undergoing beta testing.
And why doesn’t Zanzito have its own component? It’s specifically mentioned as being an Owntracks replacement on the Owntracks component page, so why doesn’t it have a component? I haven’t tried it, maybe it’s great, but I feel as far as apps go, this is expensive.