Apple, a hardware company, is well-suited to write their own "rootkit" in-house. They no doubt have their own techniques for getting the same information that CarrierIQ gathers.
To think Apple is not interested in the same information about their customers just seems incredibly naive or like some kind of cognitive dissonance.
If anything I would imagine Apple has set the bar for how much "intelligence" can be collected on its customers and the carriers are basically playing catch up.
I could be wrong. But that's how I see it.