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UUID schemes like UID2 are inherently incompatible with literally all of the post-cookie browser proposals. This does not bode well for their future.
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Chrome monitors ad-related traffic in-browser and is therefore prepared to intervene against specific requests and styles of requests - chromium.googlesource.com/chromium/src/+/master/docs/ad_tagging.md
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Webkit has outright declared that they will not be allowing simultaneous use of new (soon to be the only way) to do conversion tracking AND UUID schemes Chronotope/1359915691516841985
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Firefox's existing interventions and partnership with the Disconnect list mean that there is no way UUID requests are flowing through that browser.
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Microsoft Edge's proposal notes the need to split requests that include identifying data from any new methodology - github.com/WICG/privacy-preserving-ads/blob/main/Parakeet.md
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Something like FLoC or Turtledove is on-its-face incompatible with UUIDs as they turn FLoC IDs into tracking vectors instead of anonymizing ones.
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Advertisers are going to have to choose, do they want data-rich contextual, cross-site contextual, & conversion tracking.... or pointlessly attempting to challenge tech in an arms race over tracking individuals--a thing not possible in any other ad medium. Chronotope/1369296644198502401
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So much effort, time and money going into a thing that isn't needed and isn't possible to preserve as a technique past--at best--the next few years. Chronotope/1381951319615938563
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That the conversation has even moved so far in the direction of 1 to 1 user tracking at a time when literally everyone outside of the ad tech industry is calling for *less* tracking of individuals is insane & challenges the idea most ad tech serves advertiser, user or publisher.
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Unique User Identification for web advertising is an already rotting branch of technological development. Step on to it with caution and the knowledge that if it supports you at all, it won't for long. This is where many have to be right now, but it won't last.
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1-to-1 cross-site individualized user tracking ain't it chief