Amazon was an important pioneer in selling DRM free MP3 files, but they couldn't break the back of the whole industry like Apple managed to.
As for the App Store DRM, I'm not sure how that's any different than Steam, which everyone seems to agree is a great model for both customers and developers.
Apple's App Store and Steam both allow you to install the same application on multiple devices.
I'm not sure if you can point to a better model that's been successful in the past. Some indie developers have done alright with DRM free games, but they depend on community goodwill to keep themselves profitable, something a large corporation has a much harder time doing.
As for the App Store DRM, I'm not sure how that's any different than Steam, which everyone seems to agree is a great model for both customers and developers.
Apple's App Store and Steam both allow you to install the same application on multiple devices.
I'm not sure if you can point to a better model that's been successful in the past. Some indie developers have done alright with DRM free games, but they depend on community goodwill to keep themselves profitable, something a large corporation has a much harder time doing.