but… but… most of earth’s water is carbonated

doesn’t even matter. what matters is the meta data. if the data from the list say you like science videos with emphasis on electrical engineering, star wars podcasts and mmorpg let’s plays - does that data go away apon history deletion. what about meta-meta data. if the meta data puts you on group X that receive content Y, does that go away apon history deletion. and what kind of integration does that get with the rest of the google knowledge about you…