Think about it, Google Maps is (I think) the biggest collection of map data and information on locations everywhere around the world, yet I don’t want an advertising company knowing that I just went to a fast food place.
YouTube is an endless trove of video content that anyone can contribute to, yet I’d much rather not give an advertiser information on every little interest that I have in video.
It’s so bad for you, but it’s so good.
My guess is that it’s because the area we live in has a decently sized immigrant population, usually Middle East/North African.
Those countries are probably a lot more appealing to them than they are to us, but the algorithm lumps us all in in the same demographic.