None of this account for differences in purchasing power and phone price.
If you have an $150 Android device, I would of course expect you to spend way less on software than somebody with a $1500 iPhone.
I’m not saying ‘develop for Android only’ but if your business relies on one ecosystem only, you’re at a higher risk and you’re leaving money on the table.
Duh. Same goes for Steam games and most of digital content.
If you want to keep it, there’s usually always an option to sail the high seas.