Heads up, this is what iPhones will be like with an open app store. You'll be waiting on Verizon to get their ads into the latest version of iOS before you can install it.
Just because there’s an open App Store doesn’t mean apple has to give root to random organizations (I’m not even sure what confusion caused you to link the two ideas.)
That would happen if apple allowed other organizations to customize the OS which is a different discussion.