The weighing of leverage is more or less how the market has and still works to this day. Thus if you send me or my family out there to negotiate with Popeye's (which really wants you to create an account), or Walmart, Facebook [1], or even a small company making todo apps, I will simply not win, and neither will my family members.
I love that cross-app tracking is now opt-in, because that's not something I'd ever imagine negotiating with any company, ever. I love the fact that all subscription-based services purchased through the iOS platform can be managed in a centralized place. I love that companies that provide services on iOS must provide a way to register with Apple's anonymous account service. I love that companies seeking payment on the iOS platform must support Apple Pay, which protects my payment information.
Without Apple I'm not sure how you'd ever negotiate these things to happen.