When EU citizens visit their governments online, or when they access public health service resources about sensitive issues such as pregnancy, sexual health, cancer or mental illness, more than 100 commercial companies are systemically and invisibly tracking them. Once collected, this data can be resold via data brokers to organizations both in- and outside the advertising industry.

https://www.cookiebot.com/en/hidden-tracking-of-citizens-on-eu-government-and-health-sector-websites/