Nearly all of them lie. I lock down my browser so tight that nearly nothing gets through. Most of the time I'm looking at photos of cats or reading an article. There's no need to set a cookie or run a script. If the simply has to set a cookie, it goes away as soon as the tab is closed. Additionally, I don't stay logged into any sites so no way to attach it to my account. And, finally, I only use certain sites on one computer/device. The others have them and their associated domains blocked at the hosts level (did you know facebook owns over 1000 domains?)
Nearly all of them lie. I lock down my browser so tight that nearly nothing gets through. Most of the time I'm looking at [photos of cats](https://c8.alamy.com/comp/B52A69/bad-habit-domestic-cat-eating-spaghetti-B52A69.jpg) or [reading an article](https://isotropic.org/papers/chicken.pdf). There's no need to set a cookie or run a script. If the simply *has* to set a cookie, it goes away as soon as the tab is closed. Additionally, I don't stay logged into any sites so no way to attach it to my account. And, finally, I only use certain sites on one computer/device. The others have them and their associated domains blocked at the hosts level (did you know facebook owns over 1000 domains?)
Many websites say they require first-party cookies for functionality. It might be asking too much from script-blocking programs to distinguish between fake and real first-party cookies.