Looks like Google is being investigated again with the Irish Data Protection Commissoner opening an investigation into its ad exchange.
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rte.ie...]
""The purpose of the inquiry is to establish whether processing of personal data carried out at each stage of an advertising transaction is in compliance with the relevant provisions of the General Data Protection Regulation (GDPR), including the lawful basis for processing, the principles of transparency and data minimisation, as well as Google's retention practices..."
Regards...jmcc