The problem is remarketing used to work great without sharing email addresses with ad platforms. Now without cookies, you typically want to share email, phone,

The problem is remarketing used to work great without sharing email addresses with ad platforms. Now without cookies, you typically want to share email, phone, zip code, etc in order to do remarketing without 3rd party cookies. No ephemeral 3rd party cookies = ad platforms rely on user data that never changes (email addresses, phone numbers, etc)