Because the word "tracking" can include request monitoring for DDoS mitigation and scraping detection, or storing information purposefully uploaded by other people (e.g. photos and contact list), saying anything about "tracking" isn't very meaningful.

Think of how many people are being involuntarily "tracked" by Dropbox because others are backing up photos in which they appear, or emails they sent, without their consent. For better headlines, we could call this information "Dropbox Shadow Dossiers".