I will leave this picture here:
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All of those selections, literally all of them except the apple app store offer alternatives within their own space.
All steam games on every supported platform have an option for other stores and direct purchase. Same with Epic and the rest.
All console games offer purchase of games via disc/cartridge in any vendor shop you choose.
All physical stores are essentially the same and kind of defy the point here, as the mere existance of choice there is the choice. Can shop where you want for product you wish at whatever sales they provide.
Now for mobile--
Android allows sideloading and multiple stores.
Apple only allows the apple app store. Only. Full stop. That's it.
Monopolistic behavior does not require a monopoly position, and is, in and of itself, a legal issue. There are people who claim we have a choice in what phone we buy, there are those who claim that Apple only has a ~20% market share in phones worldwide -- but the point is: what if it were 80%? At what point does bad behavior really mean it's bad? Apple does not allow competition
for developers in the Apple space. And the consumer pays that price for not having choice -- choice drives the price down, monopolistic behavior drives the price up.
You don't have to love or hate Apple to really understand this position and the gamesmanship that Apple is playing here.
"But you can just buy Android!"
Yep. That's true. Really helps Apple as well, doesn't it? Understand that I come from a position of wanting to actually like Apple, but this behavior can only end badly.