Most people don't grasp the _extend_ of what they give to the advertisers. Not even in the slightest way. They still think that as long as they don't fill out a questionnaire, "they" won't know.
Right, it's like if you think about searching for some controversial thing and get as far as typing it into the search bar then think I don't want this in my permanent record and close the tab. Too late, every keystroke was already sent as you were typing! Surprise! Or an angry message that you think better of sending, the recipient might not have it, but it's still recorded and may or may not be used against you in some way in the future.
Right, it's like if you think about searching for some controversial thing and get as far as typing it into the search bar then think I don't want this in my permanent record and close the tab. Too late, every keystroke was already sent as you were typing! Surprise! Or an angry message that you think better of sending, the recipient might not have it, but it's still recorded and may or may not be used against you in some way in the future.