The definition of anonymity you are using here is completely unhelpful. When someone knows how to recognize you as the person to apply certain stimuli to in ord

The definition of anonymity you are using here is completely unhelpful. When someone knows how to recognize you as the person to apply certain stimuli to in order achieve a certain result based on previous observation of your behaviour (with increased probability), you are not in any meaningful way anonymous to them. At best, you could say that you are pseudonymous. You don't need to know someone's legal name in order to abuse information about them to exercise power over them, and that is was data protection is about.