Most modern data collection uses embedding vectors. Those vectors are just a short list of numbers (for example, 128 decimal numbers). However, from those nu

Most modern data collection uses embedding vectors. Those vectors are just a short list of numbers (for example, 128 decimal numbers). However, from those numbers, one could make a pretty accurate guess about your sex life, political alignment, desire to buy a lawnmower, or how many rotten teeth you have. In fact, even the developers of the system don't know what the embedding vectors will be useful for. They just know that if they take a bunch of data and create a user embedding vector, then that vector typically doesn't count as PII, yet can be used for almost all moneymaking schemes.