Do other manufactures shoot in the log mode that this is specifically taking advantage of? If not, there's no point of it from any other millions of apple on the Play store.
Well, there is the Camera2API RAW stream on android which is even more powerful that shooting in log mode.
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.