Great question — answering as the UphillTech team:
I am not sure that this question belongs here, as it would not seem related to being a webmaster. For future reference, maybe Superuser.com would be more appropriate. In answer to your question - Websites control exactly what trackers they have, as these trackers are added due to actions of the web designer or web master. Websites can, of-course, only block trackers which they have control over - ie they embed code for in their websites. As a relevant aside which may help - Web Trackers very often "come along for the ride" when a webmaster embeds functionality into the site - Google Analytics requires Google tracking to work - so when the code to enable Google Analytics is embedded, so is...
Full answer by davidgo: https://webmasters.stackexchange.com/a/133737 (CC BY-SA 4.0).
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