I see you are getting downvoted, but it's still true. An Android app brings in a fraction of the revenue. In case someone wants numbers: Look for the total revenue of Apple's App Store compared to the Play Store and then look for the total number of devices for each. It's a huge difference.

Of course a business will cater to the lucrative platform first or even exclusively.

And now, go ahead, downvote me as much as you want. Won't change the calculus though.