Comment by overfeed

While it's the privacy advocate's ideal, the politics reality is very few governments will deploy "privacy preserving" cryptography that gets in the way of LE investigations[1]. The best you can hope for is some escrowed service that requires a warrant to unmask the identity for any given token, so privacy is preserved in most cases, and against most parties except law enforcement when there's a valid warrant.

1. They can do it overtly in thr design of the system, or covertly via side-channels, logging, or leaking bits in ways that are hard for an outsider to investigate without access to the complete source code and or/system outputs, such as not-quite-random pseudo-randoms.