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"User-interface customization" cookies are actually explicitly exempt from EU consent requirements: http://ec.europa.eu/ipg/basics/legal/cookies/index_en.htm

I believe they should not be affected by GDPR either, since they're not actually identifying a person.

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Yet you could use them to do that once there is a significantly high amount of customised settings ...

Wasn't there some website where you could pull a relatively small number of easily accessible prefs from the browser (OS, list of fonts, browser, etc.) and get a nearly uniquely identifying set of facts about someone?

https://panopticlick.eff.org/ ?

Yup, the fingerprinting portion of that was what I had in mind.

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