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There’s something ominous about the speed with which the entire world has marched to require identification on platforms and, as I expected, begin the process of banning anonymous VPNs.

Do you know who/what is leading in terms of cryptographic, privacy enhancing identification technologies?

Unclear on what you’re asking here. “Privacy enhancing identification” seems like an oxymoron. Identification, in the sense of tying activity to a real world identity, is inherently an information-disclosing / privacy-reducing activity.

Bad terminology, maybe, but I mean something like: can you verify age to access social media without uploading a photo of your passport?

Anonymous credentials is possible, but the infrastructure needed for it is complicated and it gets defeated entirely by one person acting as a proxy

I'm not convinced there is *no* way to defeat proxies, esp. if our goal is high-but-not-perfect reliability. But these aren't new problems with anonymous credentials. My original question was where the state-of-the-art is, essentially