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I'm not bothered by targeted ads. I'm bothered by the idea that someone who has amassed all the information about me to show me well targeted ads can do other things as well.

For instance, they could sell pseudo psychological profiles or provide scoring services to potential employers, banks, insurance companies, landlords, users of dating sites or governments.

They could be subpoenaed and hence make me vulnerable to extortion by everyone with a sufficiently large legal budget or a political interest. The data could also be stolen by organized criminals.

In other words, it would give great power over my life to anyone who gets hold of that data, and therefore I do not want this kind of data to exist.