Social media has a far better grasp on it. They use association trees etc with "trust" based on how long each person in that tree has been online and so on.
You are nowhere as anonymous as you think, this is why the 3 letter spaghetti agencies buy data from social media, it is more up to date and more reliable and they have far better cross linking than they do...all voluntary, well mostly, because anyone to tags you in a picture etc has now identified you visually and they will scour all photos in the swarm of data that you are linked into (age groups, Race, Education, Church, Location, etc etc etc) to find other pictures and more associations.
IIRC Zuckerberg said years ago they knew where 95% of the people in the world lived to within 1km, that will have plummeted as they access property ownership records, shipping records etc from Amazon, Uber, etc etc etc.
There are a million data points linking you, your CC being used in a cafe, which correlates to your phone being there, or you watch or laptop, etc etc etc + links from security cams, you know all those Rings ones etc.
You are deluded if you think you are not known.