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It was a deliberate decision to create the RTB advertising system in this bad way, and even worse, the data industry has since then been fighting hard to keep it running, for years, at any cost, from lobbying policymakers to trying to delay GDPR enforcement.

Anyway, thousands of adtech firms and a much larger number of publishers and advertisers have NO CONTROL over who they share personal data with.

Which means they cannot have a legal basis to do so under the GDPR. Which means it's illegal.