Here’s the problem with aggregation. Even if the if is not attributable to you as an individual the data can still be used as a weapon against you. I’ll give an example: Imagine that you are a gay person living in a country that kills gay people by law. If gay people are frequenting websites that indicate they like to hang out at a particular bar, this gives authorities more than enough to target that group while still not using your personal data directly. The indirect aggregated data is just as harmful as if they had targeted you personally. This is where companies try to fool you into thinking you are safe to give them a “non identifiable” advertising id and aggregating your data before selling it. It’s not safe.