The Data Privacy plug-in has been released on the Asset Store:
If you use both Unity Ads and Analytics, the opt-out mechanism provided by Unity Ads applies to both services. If you do not use Unity Ads, but do use other Unity services, such as Unity Analytics, IAP, Multiplayer, or Performance Reporting, then you must use the Unity Analytics Data Privacy plugin to provide an opt-out choice to your players.
If you have any questions regarding GDPR, please contact DPO@unity3d.com.
If you have any issues with the plugin, please let us know.