Comment by coppsilgold

My understanding is that the way they do these attestations still links whatever account you did the attestation for and your real identity.

It's possible to do truly anonymous ZKP's of being a member of a set (eg. over 18s) but in practice it would be very cumbersome. It would involve having a setup with a central authority (government) to build a Merkle tree where users would submit hashes of randomness and then a user would generate a token through a ZKP that would decouple them from their real identity with the anonymity dependent on the set size. New participants can be brought in but the anonymity set sizes would fluctuate.

Even with this method it will link together all services utilizing the token. And if you attempt to solve this by allowing to generate multiple tokens the entire scheme becomes somewhat meaningless as durable bypass services would emerge.