All I’m really getting at is that the layers of complication are thick. I feel like one could unwind this with a lot of effort, but I doubt anyone is being utterly fleeced (or is utterly innocent, for that matter).
Are the current-day costs of those "myriad things" in any way comparable in magnitude to the 80s cost of cartridge production? I highly doubt it. Bandwidth is cheap enough that single webpages are several megabytes each, if you load everything. Card processing fees are 3-4%. My bet the breakdown of Apple's 30% is >25% "licensing" and <5% cost of provided services.
I think the $99 is more of a filter, like a captcha, for developers that mean business.
I was discussing the storage and distribution infrastructure.
Not exactly pertinent to your comment but pertinent to the conversation as a whole: If Apple/Google/Steam stored all app data for developers and also did the marketing for developers, that is closer to what 30% is worth imho. For hosting the platform, yes your grandfather was the first to stab a flag into the digital real-estate, and for that I owe you 30%? Feudalism that manages to shift cost to both consumer and developer at the same time -- impressive, but not very noble.
And according to another user, they do offer storage through CloudKit... which it appears they do, included in the dev account/App Store distribution model—1 PB: https://developer.apple.com/icloud/cloudkit/
Not even having to manufacture a physical good is a separate cherry on top of that.