Please take a look at the percentage of paying Android users. It just does not compare. It's useless to count 2 billion users in third world countries who never have and never will pay anything in-app.
Users spend <25% as much as iOS users, and less than half in total despite larger user counts (having double the users who spend <25% each does not add up!), a gap that widens year over year. Why would they prioritize that?
Why would they care about prioritizing users who spend much less? Android pays <25% per user. You need a LOT more than 70% to make that worth prioritizing. Those users are just going to eat up free tier resources without paying. It's borderline parasitic from a business perspective.
Android users are more likely to be useful for spreading word-of-mouth reputation to Apple platform users, than they are as direct spenders. Just another reason to ensure Apple platform features don't trail Android.
It is like trying to make a living selling games to macOS users.