As people's lives become increasingly lived through their smartphones, it's getting harder to draw the line between a 'digital good' and a 'real life good/servi

As people's lives become increasingly lived through their smartphones, it's getting harder to draw the line between a 'digital good' and a 'real life good/service'. It seems obvious that Apple shouldn't get 30% of what Amazon charges for a physical book. It seems obvious that an in-game power-up only exists because Apple created the tools, devices and ecosystem for developers to reach (and monetize) so many users. But amplifying a social media post isn't so clear (to me at least). It's sort of like an in-game power up, in the sense that there's no marginal cost to the seller. On the other hand, it's also sort of like advertising, which seems to me like a 'real life' thing that has marginal costs (because you need properties on which to post ads). I don't have a conclusion here. But, if you accept that Apple is entitled to a 30% revenue cut of some category of services purchased and/or consumed within iOS apps, then it's not easy to say exactly what that covers.