>The dependency goes Developer -> Apple and Apple -> Consumer, there is no reverse arrow from Apple to the developers.

Is that really true? If Apple is abandoned by large developers (let's say of Adobe, Microsoft calibre), does it not harm their sales or revenue?

It certainly isn't universally true. For young or new platforms, like the transition to ARM a few years ago, or the Vision Pro today, Apple needs developer adoption to be successful.

Of course, it's existing success on other platforms almost ensures a certain degree of developer engagement with their new products.