Thing is - this kind of behaviour is what I want to avoid by buying iOS. If I wanted multiple stores - well that capability already exists, I buy Android. There's no monopoly, I can buy an Android device tomorrow. I can buy one right now online.
The argument is made that if alt stores become available then it's a user choice as to whether to install them or not - no-one's forcing me to and I could just stick with Apple's. Well, this behaviour from Sweeney is exactly the counter-argument - the moment alt stores become possible, every corporate exec and their dog will immediately insist on their apps only being available via their store, with none of the same rules as the main one. All the web dark patterns would be back - an obvious one might be no one-click unsubscribe, for example.
It's less open, but that's the trade off I actively chose to make when buying an iPhone over an Android phone. Those who prefer Android made different choices - absolutely no shade on their preference, good for them for picking what they'd prefer. But it's stripping my choice away when people try to turn iOS into the same thing.