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Like many things it’s a combination of many answers, but from my own experience it’s a simpler pipeline with Apple phones. On Android it’s supporting tons of screen sizes, out of date versions, different vendor modifications to the OS.

Looking at it as iOS vs Android isn’t correct because Android is a fragmented mess.

Technical aspects aside (no OS variance, etc), iPhone apps make more money than Android (2x or more, last I checked, despite being a smaller share of total phones). So targeting iPhone first is a common strategy

iOS has more market share in the US than Android. Regarding paid apps, iOS has higher app store revenue than Android overall.

You are overthinking it.

This looks like something that evolved from a side/hobby project, so it must've been made for whatever devices that devs themselves use. That's it.

Android app is under development right now.