The Palantir connection isn't the only bad bit here:

Sure enough, Discord's support article describing its age verification process now features a disclaimer informing UK users that they "may be part of an experiment where your information will be processed by an age-assurance vendor, Persona." And while Discord had previously insisted that facial age verification recordings would only be stored and processed locally, the notice about Persona says that "the information you submit will be temporarily stored for up to 7 days, then deleted."

They tried so hard to convince people the verification would be safe, and they're already experimenting with making it less safe.