custom_audience

Name	Modifier & Defaults	Type	Description
custom_audience_targeting	Read-only Default: Multi-Targeting Object with `state` = ALL	Multi-Targeting Object	Holds a reference to the campaign's custom audience targeting details. (If no targeting exists, an empty collection is returned.) (See: Get Custom Audience Targeting)

{
   //other Campaign fields...
   "custom_audience_targeting": {
      "state": "EXISTS",
      "value": null,
      "href": "https://backstage.taboola.com/backstage/api/1.0/demo-advertiser/campaigns/1234/targeting/custom_audience"
   }
}

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The value property is always null.

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If you created any custom audiences with exclude_from_campaigns = true, then those custom audiences will be excluded from all campaigns.
Campaigns that you create going forward will have this exclusion by default. Moreover, the exclusion will be applied to your previously existing campaigns.