Google takes information from the database of personal information it knows about you (called "Kansas" when I worked at Google 15 years ago) as some of the inp

Google takes information from the database of personal information it knows about you (called "Kansas" when I worked at Google 15 years ago) as some of the inputs to its ranking system. These days, the score for a page is the output of an ML model that takes in hundreds of scoring signals, both related to the page and to you, and then you get shown the highest score pages. So, unless you and someone else are both searching over Tor (maybe you even need exit nodes in the same country), you're probably not going to get identical results for identical queries. This is what people are complaining about when they complain about Google "personalizing" search results.