> Since there is only one app store for iPhones, almost every app vendor is willing to conform to Apple's guidelines (which are often pro-privacy and protect the user). Otherwise they lose out on a significant market share with a lot of spending power.

You've just described why these changes are good. I feel like the word "willing" in your statement is carrying a lot of weight.

Apple forces developers to publish from Apple devices, spend $100 a year for a developer account, give up 15-30% of any revenue generated from that app, use WebKit, etc.

That is not at all what I describe as restrictions that lead to "willing" app vendors.