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upstart writes:

Apple's 'Do Not Track' Button Is Privacy Theater:

Earlier this year Apple received ample coverage about how the company was making privacy easier for its customers by introducing a new, simple, tracking opt-out button for users as part of an iOS 14.5 update. Early press reports heavily hyped the concept, which purportedly gave consumers control of which apps were able to collect and monetize user data or track user behavior across the internet. Advertisers (most notably Facebook) cried like a disappointed toddler at Christmas, given the obvious fact that giving users more control over data collection and monetization, means less money for them.

By September researchers had begun to notice that Apple's opt-out system was somewhat performative anyway. The underlying system only really blocked app makers from accessing one bit of data: your phone's ID for Advertisers, or IDFA. There were numerous ways for app makers to track users anyway, so they quickly got to work doing exactly that, collecting information on everything from your IP address and battery charge and volume levels, to remaining device storage, metrics that can be helpful in building personalized profiles of each and every Apple user.

[...] Here's the thing. There's been just an absolute torrent of studies showing how "anonymizing" data is a gibberish term. It only takes a few additional snippets of data to identify "anonymized" users, yet the term is still thrown around by companies as a sort of "get out of jail free" card when it comes to not respecting user privacy. There's an absolute ocean of data floating around the data broker space that comes from apps, OS makers, hardware vendors, and telecoms, and "anonymizing" data doesn't really stop any of them from building detailed profiles on you.

Apple's opt-out button is largely decorative, helping the company brand itself as hyper privacy conscious without actually doing the heavy lifting required of such a shift [...]

In other words, it's B.A.D. (Broken As Designed).

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