“There are companies that have already had some of this data. For example, member-oriented companies. You have a membership organization, and you know every member ID — it’s not a new idea; membership-oriented companies have been around for hundreds of years. Those kinds of companies have always collected data; that’s basically first-party data. So you really then have to gravitate towards first-party data.”
https://www.google.com/amp/s/www.protocol.com/amp/cookieless-future-adobe-2653616739