Google has many more signals than link data. One underrated signal is that they have a history of what links have previously been clicked for billions of search

Google has many more signals than link data. One underrated signal is that they have a history of what links have previously been clicked for billions of search queries. And in my case they have all my search history, all my Gmail messages, all the YouTube videos I watch, all the Android apps I install, all the places I search in Google maps. And since I leave the 'track location' setting unchanged on my phone, Google also know where I live, when I wake up and go to sleep, where I work, how long I spend at the gym, where I go shopping. And since my friend also has an Android phone, they likely know that he's my gym buddy and how often we get together. And since my girlfriend uses Google Maps on an iPhone they can probably see that she's my girlfriend and where we like to go out together.