From Hunton Andrews Kurth:
The CNIL received a complaint concerning Apple’s ad personalization practices on the App Store and carried out several investigations between 2021 and 2022.
The CNIL’s investigations concluded that Apple was collecting the identifiers of users that visited the App Store using the old iPhone operating system (version 14.6) for several purposes, including to personalize ads shown on the App Store. Apple was collecting such data by default, without obtaining users’ consent.
Read more at Hunton Andrews Kurth.