but such purchase is untraceable to you as PII. neither google nor mastercard learns the linkage details to the data the other holds, they just learn that data is linked.

you can opt out by not using your gmail account as an addres on your mastercard.

and i believe there’s an explicit opt out as well.

this measures conversion but in a privacy safe way, so it’s actually good thing.

the google implementation that is. i guarantee anyone else doing this (i haven’t heard of such though) is leaking data like crazy