But you tacked on that your threat model is less than Android because Apple babysits your device. An alternative app store existing does not have the ability to

But you tacked on that your threat model is less than Android because Apple babysits your device. An alternative app store existing does not have the ability to compromise your device unless you use it. Android has many app stores and 95% of users use the platform's default one. Therefore it is the same level of security as your Apple product with more freedom should the user take advantage of it. Walled gardens are not secure.