It is just that. Greed. They would do it on macOS too if they could get away with it, but they know they can’t and so don’t make the argument. What? macOS doesn’t require investment into the platform?
That alone settles the matter for me when the apologists inevitably show up.
Download a program and you have to pay the OS maker for it was never a thing on PC but apparently a smartphone is seen differently.
The DOJ had started a lawsuit against Apple due to their rampantly greedy business practices, but who knows where that is going now since Tim Apple gave a golden trophy to the current president.
https://www.justice.gov/archives/opa/media/1344546/dl?inline