I’m not really all that informed about the details of the iOS but didn’t Apple do this since day one, long before there even was a App Store? Before the first jailbreak came out? If it has been this way forever I see no way how you could call this ‘fighting’ jailbreaking.
Before the iPhone even came out it was obvious people would try to jailbreak them, and signed firmwares are a necessary part of jailbreak defense. You're right that Apple couldn't have been defending the App Store from jailbreaks before it was invented, but back then they did care about the carriers. They had a lot to prove. Now Apple is the darling of the industry and they have no reason to kowtow to the carriers any more, but they continue to fight jailbreaks to protect the App Store.
It used to be possible to upgrade or downgrade to a forged image through iTunes, regardless of whether you bought any software that's in it. I know a few people that upgraded to 2.0 that way.
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I’m not really all that informed about the details of the iOS but didn’t Apple do this since day one, long before there even was a App Store? Before the first jailbreak came out? If it has been this way forever I see no way how you could call this ‘fighting’ jailbreaking.
Before the iPhone even came out it was obvious people would try to jailbreak them, and signed firmwares are a necessary part of jailbreak defense. You're right that Apple couldn't have been defending the App Store from jailbreaks before it was invented, but back then they did care about the carriers. They had a lot to prove. Now Apple is the darling of the industry and they have no reason to kowtow to the carriers any more, but they continue to fight jailbreaks to protect the App Store.
It used to be possible to upgrade or downgrade to a forged image through iTunes, regardless of whether you bought any software that's in it. I know a few people that upgraded to 2.0 that way.