Old school internet ad tech worked around what you are trying to do. We were doing this in 2003, before Google started up AdSense and well before acquiring Doub

Old school internet ad tech worked around what you are trying to do. We were doing this in 2003, before Google started up AdSense and well before acquiring DoubleClick. The way it worked at [former employer] was, we had a lot of digital properties. Every digital property collected analytics on all visitors. All that analytics got post-processed and cross-referenced until we could form a "profile" on every visitor. Because you leave a teeny tiny trail of information everywhere you go, we cobble it all together until we know who you are on each site. The probability just gets higher as we collect more data. And we'd collect data from everywhere - e-mail marketing campaigns, ad traffic on partner sites, user profile data, web surfing habits, and buying access to privately maintained databases. Even if everyone wore a mask and black clothes everywhere they went, surveillance cameras still capture height, gait, mannerisms. Watch long enough and you know "Gait #24434 mannerisms #593483 height #933 goes in/out of this residence at these specific times, goes to this supermarket, goes to this nail salon, sometimes goes to a house somebody else seems to live in". Maybe it's multiple people with the same gait, mannerisms, height - but in the same neighborhood? In any case, it doesn't matter if they are all different people as long as they behave the same way; we market to them the same. Your entire life is just a string of digits in a marketing-recommender algorithm.