I would guess that Google has the data to see that people use AI to write otherwise personal letters a lot. One of my top use cases for chargpt has been helping

I would guess that Google has the data to see that people use AI to write otherwise personal letters a lot. One of my top use cases for chargpt has been helping to write cards for birthdays, weddings or whatever. And talking to others I know they use it a lot for that too. I sense more that it is something where the "ick" factor is high, but people are generally terrible at writing and love the boost AI gives them. On Google's side though, it just looks like "damn, people really like using this to write letters to others".