Well I’m a user and I don’t want to have to make that choice. For example I’m not a big fan of Facebook, but I do use it occasionally to keep in contact with some friends.

Suppose Facebook decided to move to a different third party store on iOS, maybe their own store, so they don’t have to list their data access and sharing policies, don’t have to go through app store review, etc.

Doing that forces me to choose between rigorous app review and disclosure, and using the Facebook app. I don’t want to be put in that position. One of the reasons I use an iPhone is because of that.