I saw an article awhile ago that the police just straight up bought ad-network data about someone they were prosecuting without needing a warrant. Is there anyway to know what info ad networks have on me out there?
I know there are databrokers you can query to see what they have kn you, but those are all public records from I could find so far
Sure but who do you make the subject access request to ? Facebook Google Microsoft Amazon etc individually ?
Pretty much. I have seen a few services pop up recently that will do this for you, but that costs money, and is of course including a third party. This is why prevention is largely better than cure.