Starbucks is a corporation, it is not generic. You can't buy Dunkin at Starbucks. It is your choice to shop at either. Just as it is your choice to use either

Starbucks is a corporation, it is not generic. You can't buy Dunkin at Starbucks. It is your choice to shop at either. Just as it is your choice to use either an iPhone using iOS or a phone using Android/Google etc. Just as it is your choice to choose a car from a particular manufacturer.