Notably, by doing this Discord lied in their initial announcement. They originally said [1] that all processing would be on-device, but that's not true for users subject to this "experiment". 1: https://discord.com/press-releases/discord-launches-teen-by-...
> Video selfies for facial age estimation never leave a user’s device
> Facial scans never leave your device. Discord and our vendor partners never receive it.
Meanwhile they're also clear that uploaded IDs do get sent to "partners":
> Quick deletion: Identity documents submitted to our vendor partners are deleted quickly— in most cases, immediately after age confirmation.