> At one point I had both an Apple and a Google Android phone.

What percentage of people do you suppose carry two different phones in their pockets? Is this something you reasonably expect the majority of people to do?

> Apple preventing other app stores on iOS is more like Starbucks preventing Peet's from coming into its stores to sell its coffee.

Just look at your own words. Preventing other stores is like preventing competitors from selling in your store?

Preventing other stores is preventing other stores. You can put whatever you want in your store, they put what they want in theirs, and the customer gets to choose where to get their app.

Preventing the customer from using the other store is the anti-competitive thing being objected to. It doesn't need an analogy, that's literally what it is.