Matthias Eberl
In 2021 german publishers and shops widely started to use a cookieless tracking technology.
It's based on your e-mail and login information, so you should know about it. Especially as you are even tracked without login.
How identity providers work
⬇️[Thread]
Matthias Eberl
In this video Zeotap founder Daniel Herr explains a interesting part of his business model: Selling behavioural data from marketplaces like Autoscout24 to automotive brands like BMW. Publishers using Zeotap are getting paid for this insights.
https://www.youtube.com/watch?v=mrZ0HLd0LsI&t=81s
Indeed: The hashed e-mail from a autoscout login is transferred to Zeotap without consent.
This data is probably part of the automotive interest data that Zeotap is trying to sell on audience marketplaces.
Matthias Eberl
Identity Providers are basically recording your login and sharing this information with other pages. Here GMX sends your login ID "tpid" to Adition which shares its own cookie with several ad tech companies using a classic cookie matching. In this case only with your consent.
Other Publishers like Spiegel Online, BILD and SPORT1 track households based on the IP address (also with consent).
Matthias Eberl
The ID in the first screenshot is stable against deleting cookies, changing browsers and devices. It probably gets long term persistence by logins from other household members.
Not all pages are asking for consent. In the second screenshot you can see Gutefrage.net working together with Berlin based startup Zeotap to send the hashed e-mail from a login to Google, Xandr, Mediamath, Adition and The Trade Desk.
Regarding privacy, everything is lost now.
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