This is also why the official SyncThing Android app stopped being distributed. There is a fork but it's not available on the Play Store.
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I was a bit surprised that the official client suddenly disappeared though.
Here is when syncthing dropped the official Android client [0] so you can read through their rationale and the HN response at the time.
I am not an Android developer but I do follow this space; I had the impression at the time that it really was mostly about the dev cycles that would have been required and nobody willing to do the work.
I do wonder why they don't just make the fork an official Syncthing project, it seems like the obvious solution would be to officially bless it. I can only guess the maintainer likes their independence.