There is less of a difference between those than there seems to be, there are a lot of interesting research papers and experiments regarding methods to create a

There is less of a difference between those than there seems to be, there are a lot of interesting research papers and experiments regarding methods to create a feedback loop between targeting ads and then identifying those targeted. If I narrowly target an ad and then I know you saw it, I now know all those things about you. So, yes, they do not literally sell your information, there is one level of indirection there. And the amount of information that data brokers get their hands on tells me that it is very likely people are exporting this information regularly.