--- I was a Mac user and an Apple fan in the 90s and early 2000s, and we all know that was a rough time to be a Mac user: Because it was clear that Windows had won. If you asked a typical PC buyer why they chose Windows, their answer would go something like this: "All the software I need is on Windows. Windows has the REAL version of Office. Windows has IE6, the REAL internet. Windows has all my games, and my work software." Like the iPhone, the Mac was technologically superior in many ways, but that did not stop the Mac from shrinking to only a 5% market share, ceding its place in PC history to Windows.
Today, the iPhone enjoys the breadth of 3rd party software the Mac could only dream of. People pay $1000, sometimes every year, for a phone! This has transformed Apple's fortune from a struggling company into the most valuable company in the world. Why are people willing to pay so much for a phone? Because it is so much more than a phone. And why is it so much more than a phone? Because of the all 3rd party software expanding what the smartphone could do beyond what anyone thought was possible. So, why on earth would you put a tax on something that helps you so much, that it likely made the difference between being the distant loser in the PC era, vs being one of two major winners in the smartphone era? ---
There's a lot of different angles people arguing about this, but this is my favorite: Which is that the FLOW OF VALUE GOES BOTH WAYS. I find the tone that Apple takes on this arrogant: They really believe they are doing developers this huge favor by creating the iPhone and the AppStore and the flow of value flows massively in one direction, from Apple-to-Developer. But I sincerely do believe that 3rd party software is what made the difference between the fate of the Mac and the fate of the iPhone, and the respective difference in Apple's fortune. For as much as one could gush about iPhone's incredible hardware and software lead, the Mac had those same things going for it and still lost to Windows because of the software.
For Apple to turn around an rent-seek against one of the core reasons why the iPhone is successful, is to me, an incredible betrayal, and made possible only because of the gross difference in power and market concentration.