alt Hacker NewsWhich even halfway credible app developer would sell you that info? You know that’s illegal right? You might get some stupid indie developer to do this but no chance for anything even half big.
But if you can get actually get this data, maybe try to do this on yourself and write a blogpost about it. I highly doubt you’ll be able to.
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Most app publishers are halfway credible at best, so it's not much of a problem. Even the halfway credible ones often use SDKs that do this.
Get your hands on a random selection of 10 iPhones and look at the apps installed. I suspect you’d be horrified. As an example - any parent who has installed a free game for their kids likely has all of this info, plus more via tied in logins.
That said, I agree with the rest of your point - you’re not going to go to a developer and offer them $100 for this data on a person (and if you could, you’d still need to tell them which person, which if you could do you could just get the data yourself)
I've never made an iOS app and don't have plans to. But my assumption is ~every >= medium-sized iOS app would be monetised by selling data to aggregators.