Visiting health sites first maximizes the chance that data brokers can track you across sites.
If you visit 450 pages on 15 major health, education and news sites, 1121 third parties set 891772 cookies.
Observing the same personal identifier (aka pseudonymous cookie ID) across two websites proves that both sites help a third party to recognize a user again, and thus facilitate personal data sharing.
EU data protection authorities must adopt this methodology to gather evidence.
For example, the study observed 52 third-party trackers sharing user identities between website visits on Forbes and WebMD.
This proves that Forbes and WebMD facilitate personal data processing on visitors of both sites through 52 other companies. What’s the GDPR lawful basis?