"Information from your Connected Apps and other Google services you use with Gemini Apps (such as your Search or YouTube history, or your page context and URL from Chrome). If you change your Gemini Apps settings, other Google settings won't change. Those settings, like Web & App Activity or Location History, may keep saving location and other data as you use other Google services."
Gemini pulls in data from Search history, YouTube history, Chrome browsing, Gmail, Google Photos, and other Google services, creating a unified profile across the Google ecosystem. Opting out of Gemini tracking does not stop other Google services from continuing to collect data.