The article discusses how device fingerprinting has become a new method for tracking users online, allowing companies to collect data and create detailed profiles. This method is more invasive than traditional cookie-based tracking and can be used to identify users even when they use incognito mode or VPNs. The article explains how fingerprinting works and how it can be used to collect information about a user's device, browser, and behavior. Companies can use this data to target ads, but also to sell to the highest bidder, including governments and other organizations.