EDIT ---
Ok, I get it now. Personalized ads = surveillance. Fair enough.
Doesn't the whole GDPR already cover it though? You can opt out of the surveillance.
* Micro-targeting for political advertisements (pretty bad for democracy)
* Dynamic pricing based on demographics (you can afford it, so you pay more)
* Insurance knowing too much about you (rejections based on your health, ensuring parts of the population won't be able to get good insurance)
* And just the fact that too much information being public can be harmful (blackmail, scams, etc)
* etc..