In setting up a similar audiences list for a Google Ads campaign, Antonio is wondering whether he needs to exclude people from his original remarketing lists. A colleague tells him he doesn't need to do this. Why does the colleague tell him this?

Similar Audiences are built from a seed audience such as remarketing lists to find new users who resemble the original list. The original seed members are not included in the expansion audience, so a separate exclusion is unnecessary. That keeps prospecting focused on new users instead of overlapping with re-engagement traffic. In current Google Ads documentation, the same rule appears in Lookalike segments, which automatically exclude users in the seed lists