With or without YouTube Premium you can opt out: if you go to https://adssettings.google.com/ https://adssettings.google.com/ (and signed in, as you would be if

With or without YouTube Premium you can opt out: if you go to https://adssettings.google.com/ https://adssettings.google.com/ (and signed in, as you would be if you're a YouTube Premium user) and click on "Advanced", there's a checkbox that says: > Also use your activity and information from Google services to personalise ads on websites and apps that partner with Google to show ads. This stores data from websites and apps that partner with Google in your Google Account. Unchecking this means (as I understand it) that, among other things, your YouTube watching behaviour will not be used for ad targeting on non-Google websites. (That's about non-Google websites, but as I type the above, I just realized that maybe by "all other mediums" you meant other Google sites, like Google Search etc. But those already covered under "Ad personalisation" (the main toggle at https://adssettings.google.com/ https://adssettings.google.com/) so I'm not quite sure the premise of the question is correct.)