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The theory has been at some point they'll remove the separate ID and have a single ID that encompasses both. Due to things such as Apple's automatic tracking link removal (but also many others): https://9to5mac.com/2023/06/08/ios-17-link-tracking-protecti...

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Facebook started doing this a while ago https://www.schneier.com/blog/archives/2022/07/facebook-is-n...

Reddit too, but I don't have a news source for it. I can only share a link I came across: https://reddit.com/r/dataisbeautiful/s/LCv7yIwiVF

If you click on the link, you can see all the tracking parameters in the URL bar. Whosever link this is used the official Reddit iOS app to generate the unique URL.

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