[hammock]

> It's absolutely a slippery slope

The slope has already slipped.

This is IDENTITY verification, not “age verification.”

You cannot verify your age without uploading your ID.

[nly]

In theory you could do this with 3rd party verification and zero knowledge proofs orchestrated by the users browser.

Mozilla Persona comes to mind.

https://en.wikipedia.org/wiki/Mozilla_Persona

This will never happen of course because the objective is to track your every move. The government want to know every pseudonym you use on every website.