What do you mean exactly by "refuse all cookies?" The specific method you use will matter a lot. If the first thing you do when you open the browser on a new m

What do you mean exactly by "refuse all cookies?" The specific method you use will matter a lot. If the first thing you do when you open the browser on a new machine is go immediately to Chrome's content settings and switch on "Block all cookies" then I'd be very very surprised to see successful tracking and remarketing. If you just mean you're clicking "reject" on all of the cookie dialogs you see on various websites that's not going to do much.