Tim Cook's argument doesn't hold up in the most likely scenario: if users get a choice to install third party apps, the risk to a user who exclusively chooses A

Tim Cook's argument doesn't hold up in the most likely scenario: if users get a choice to install third party apps, the risk to a user who exclusively chooses Apple's app store remains nearly as low as today. And choice is what Cook does support when it comes to iOS privacy controls (except there the change to Apple is a leg up over Facebook and Google). What's best for the user, Apple's profits aside, is to provide a choice in both scenarios.