You know I don't actually mind sharing pretty much all my info if it's for the right reasons, as I have a deep trust in people in general, and only a few are authentic asshats in my experience.
The thing is that I also value my freedom and I don't appreciate people not genuinely asking for my consent to share. At the end of the day it is my data and I decide what will happen to it.
So sure, I am being tracked all over the place and there's no stopping it, but for me it's more a matter of integrity to express my desire for consent. In other words it's not necessarily effective, but it's the intent and expression that counts for me.