I like the phrase “de-facto regulatory power.” Not only is it the case that we don’t have to deal with annoying stuff like “enable the facebook store to download our app,” that is, poorly behaving apps in non-official stores. It also takes away one of bluffs that Facebook and friends could make. They don’t even have the ability to say “Apple, make your rules more permissive or I’ll open up a Facebook store.” They don’t even get to negotiate. It is great.

If alternative app stores were allowed, I’d probably download a GNU iOS store. But that’s about it, and it just isn’t worth it.