We all accept that a man has a right to expect an evening of pleasant company if he buys a woman a nice dinner. It's a reasonable expectation that makes sense.
We are all creeped out, despite the fact that it's ubiquitous, when a man assumes that the woman will have sex with him because he bought her dinner. We are downright angry if he acts on that it either by forcing her or by being mean to her if she does live up to his expectation.
Which is to say, there is an implied obligation incurred when we accept free stuff but that obligation is not unlimited. The distinction between 'pleasant company' and 'assumption of sex' is level of personal intrusion. They are divided over a boundary that all decent people understand as intrinsic to the natural human rights of a person.
I claim that it is reasonable to expect me to see advertisements but that it is creepy and makes me angry when they share my personal information with anyone if they feel they can benefit. I think it's wrong. I think it's dangerous and intrusive.
There are people who focus on the supposed benefit of targeted ads. "Why wouldn't you want the big old internet figuring out just what you want? It showed your new favorite band. What's wrong with that?"
To me, that's like saying, 'the guy was clean and a considerate lover. She even had an orgasm. Why are you mad that he coerced her into having sex with him?'
I am a huge fan of Europe's GDPR. It recognizes information about you as yours. Their constitution explicitly asserts that privacy is a fundamental human right, just as we all understand that we all have a fundamental human right not to be raped. (And no, I'm not saying that privacy violation is the same, or as bad, as rape, or murder. I am saying it is analogous.)
I would add that I think that the level of coercion is worse than expectations for after dinner. These corporations are holding my friends and livelihood hostage.
If I do not make myself vulnerable to their depredations, I do not get to talk to my friends on Facebook. I live in a remote location. I have very little social contact without it and its ilk. I would be alone. I need to use Google a hundred times a day to do my work. Practically speaking, I would be out of business without it.
These corporations are essentially saying to me, "You choose, starve and be lonely, or let us sell your information to anyone we feel like selling it to. You live your life seeing your secrets [one time I googled breast cancer about a friend; for the next couple of weeks, corporations made clear they knew about it in ads] spread all over the internet. Don't like that, Tough shit."
I am pissed. I do not grant them permission to share my information and consider their doing so to be unethical and when I notice it, I feel violated.