Been avoiding internet ads and tracking for 15 years now. I feel like the unibomber. Facebook and google probably still have a good fingerprint on me, though, due to iOS not letting you use good ad blockers.
Something uncanny happened recently in terms of the ads I do see that gave me quite a bit of paranoia. My SO recently bought a distinct pair of leggings. How am I seeing ads for that same exact pair of leggings, on my phone? I don't think I've ever typed out the word leggings on the internet before this very comment.
But you live in the same household, and probably use the same internet connection, as someone who did likely search for and buy leggings. They use this information when correlating.
Unabomber not Unibomber, not that it matters. Ted Kaczynski, the man you are referring to is a fascinating man, try to ignore all of the recent hype and delusion following that Netflix series. I encourage everyone to read his book "Industrial Society and Its Future", he is without a doubt a luddite but presents some very compelling reasons in the book, if nothing else it will give you some insight into a rather notorious but perhaps unfairly represented character.
Something uncanny happened recently in terms of the ads I do see that gave me quite a bit of paranoia. My SO recently bought a distinct pair of leggings. How am I seeing ads for that same exact pair of leggings, on my phone? I don't think I've ever typed out the word leggings on the internet before this very comment.