I think this confirms my point.

Note that as per Epic’s other lawsuit, the Amazon App Store is working at a severe disadvantage to Google Play.

It refutes your claim that developers will end up having to support alternate app stores or risk losing on market share. Despite the potential for greater revenue on the Amazon Appstore, developers don't seem to be flocking to it.

People seem to be buying into Epic's own claims of self-importance. They may be the ones to have finally advanced grievances against the App Store to the lawsuit, but they do not- nor should they- have the ability to frame the entire discussion. Their standards for openness are debatable.

It doesn’t really refute my claim. For one thing for most developer, Android is an afterthought in terms of profitability because of iOS, and for another, secondary app stores don’t function on an equal footing with the play store, which is why Epic is also suing Google.

Android just isn’t a model for what would happen on iOS. Obvious really, because Android has never had anything like the same success in app sales.