What criteria could not be used to create a Dynamic Re marketing audience?

You can use broad behavioral criteria like having simply initiated a session on your site or opened your app, or you can use more narrow criteria like interacting with specific products. When a user’s behavior meets the criteria you’ve specified, the associated cookie or Device Advertising ID is included in the audience. When any of the users with those cookies or IDs later visit sites on the Google Display Network or use Google Search, they are eligible to see one of your remarketing ads if you win the ad auction. Users who returned an item is not a criteria for remarketing audience.