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Does anyone know how the IDs can be anonymous? What's stopping anyone from associating the ID (presumably sent as a header?) with an account on my site?

Is it maybe like an OTP based where google and chrome generate a new ID for every request, opaque to the intermediary but google can correlate them later?

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In Apple's system, at least, each app gets a different ID for the same user. So supposedly you can't track a user across sites/apps since the user will have a different ID for each.

I believe it's each set of apps from the same developer. Apple's developer docs say the device identifier changes if a user deletes all of your apps, not just the current one.

short answer is that you can never be 100% sure you are remaining anonymous on the internet. The best you can settle with is that you trust the companies operating with the data not to abuse their power and stick to their word.

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