I'll offer a counter and say that if you like the Apple ecosystem, there's never been a better time to get started. SwiftUI is an amazingly great way to build apps – and again, I've been doing this for a very long time so I'm speaking from experience here.
For smaller developers, the revenue share can be as low as 15%.
Also, for anyone weighing the decision keep in mind that while iOS may not represent the largest marketshare in the world, their users are well known to spend more money on the platform compared to other platforms.