If all those metrics are being used to sell advertisements against me then I have every right to know each metric, all the details behind every single piece of data collected, from where when and whom, as well as the right to know to know how every data point and metric and is used to sell every specific advertisement to me. That means everything I just enumerated and more must be retained every time a query is run against my data or auction is ran to advertise to me.
What's that about a short list? Sorry, I may not have been clear, if you're using 1 data point or 1x10e999 I have the right to know every single one. I have the right to know the inferences drawn about me and how advertisers can target me. If companies aren't retiring data they are reckless and auditable records for every customer should help to rectify that imbalance. Likewise, if a model cannot be explained, proven mathematically, and reproduced then it's bad computer science. I'm sorry if this seems offensive but I'm sick of the whole move fast and break things when innocent people keep getting hurt or companies fleeced of their advertising dollars.
Either this stuff can be explained in reverse (so consumers know what privacy they've sacrificed, and advertisers know they're not being fleeced) or it can't and there's sketchy or bad computer science at work.