> people on iOS monetise REALLY well compared to other segments

And therein lies the motivation to "open up" Apple's ecosystem, people just can't stand looking at all those dollar signs without being able to get their hands on them any way possible.

"So Apple just gets exclusive access to their users' money?!?" Well, they are the ones that built and maintain the ecosystem. Everyone else just wants to get in there and extract wealth like slash-and-burn rainforest developers or strip-miners.