I went today through the process of deleting my entire data history from Google's servers. I went to myactivity and browsed through EACH TAB and clicked DELETE ALL ACTIVITY. I even went through location history and erased everything. I also deleted the history and data from my mobile devices. Chrome was cleaned also. There seems now that there isn't any history left, though when I enter the search bar some words, I already get predictions from websites visited a long time ago. And among the searches I see predictions that fit my type of searches (remove item from array list, remove branch from git - for the word remove). I'm wondering if Google truly let's you delete everything.