A judge in a case against Google is concerned that the company's 'incognito' mode does not provide the level of privacy users expect, as Google's analytics and advertising services can still track users' browsing history. Google's lawyers argue that the company clearly states that incognito mode only prevents Chrome from saving browsing history, but does not prevent websites from tracking users. The case centers on whether Google's description of incognito mode is misleading to users. The issue highlights the complexities of online tracking and user privacy.