There are apps for Android that allow you to record RAW video (eg: MotionCam Pro). You'll need an equivalent Android though. A high end Samsung, Sony, OnePlus, etc, supports this. A random $50-100 Android phone probably won't.
That's a super good point. My guess is any shop building apps like this are going to be doing it using some very OS specific system frameworks and are going to have a lot of domain knowledge in either android or iOS. It just doesn't make a lot of sense to pivot given the cost I suspect.