What is privacy these days? The USPS tracks every letter, or at least takes a picture of it (who knows what they do with that). The phone company always knew who you called, but they didn't care. Your mailman sort of knows what mail you got. Your friends, etc know what you like.
The question isn't about privacy, because that was always an illusion. The question is who do you want to know what?
Do I want google, and by extension advertisers (or entities in the advertising programs), to know anything about me? Amazon? Apple? My phone company? The government?
At least in the US, everyone sort of has an advertising profile. Who gets access to it and why? You have no real control over that.
Sometimes, advertising can be convenient. When you're looking for a car, it'd be nice to get a whole bunch of, say, test drive for dollars coupons.
Sometimes, it can be bad - like when you get medical condition related ads at home when you didn't want anyone else to know.
At some point the public needs to have the ability to take control of this information somehow. It's unclear how that's going to happen. Are online footprints considered property rights?