> Purely curious; why not start natively with iOS or Droid (depending on which one your target audience uses more)?

That did not go well with Clubhouse. Started with iOS only and a year and a half later they added Android support after getting cloned by everyone else. Especially Discord (which is in React Native).

Today, more people use Discord Stages and almost no-one uses Clubhouse, despite Clubhouse being a native app from the start.