Going from traditional search to AI will echo that net worsening of ad-related user experience. The net surveillance is also greater because logged-out search will go away.
Maybe there's a general lesson that successive generations/disruptions of technology seem better at first but end up qualitatively worse.
It is because it is crap. When i search for "Wombat" i want the animal or the program. Not a page containing the word. Not a squirrel that looks like a wombat.