In order to exclude your current customers from your retargeting adverts, you can include the tracking inside your app and then exclude from your audience on FB

In order to exclude your current customers from your retargeting adverts, you can include the tracking inside your app and then exclude from your audience on FB, Google, Quora etc anyone that has visited logged in URLs. That way you’re only spending money retargeting website visitors who aren’t already customers. We do this at Paiger for this very reason, and I imagine DO is the same. Edit: 20 is extreme though.