At Ghostery, we did a joint study with Verified Data: Do websites stop tracking if you reject consent?
We chose pharma websites as an example. All US sites and almost all European sites still sent tracking requests to third parties.
We assume it is often unintentional (e.g. misconfigurations). But when we disclosed our findings, none of the websites reacted.
Blog: https://www.ghostery.com/blog/ghostery-verified-data-consent-study
Study: https://verified-data.com/insights/pharmacy-consent-study/
The approach is described in the PDF: https://verified-data.com/whitepapers/Pharmacy-Consent-Study-Report.pdf



