I would say non-personalized. Like many siblings say, I often see ads for products after I've already bought them (or something similar). That's just useless.

I also remember a funny experience with Google Maps 2 years ago. I had my home and work addresses on profile. They're both in the same city and close enough that it's possible to walk between the two. I was looking at the closest way to go from the office to another place not far away, on foot. The top suggestions google thought I would have a use for while looking around my destinations were hotels. When I live maybe an hour away.

So I figure if Google's recommendations are so useless even though I gave them precise information, how exactly is some random adtech company going to figure something useful for me when all they supposedly have is infered information?