Comment by coppsilgold

The idea behind blind signatures is that the server will give you a signed token which is blinded and you can un-blind it on your end and then use it. The consumer of the token will not be able to collude with the issuer of the token to figure out who it was given to. There is more info here: <https://blog.cloudflare.com/privacy-pass-the-math/>

I don't know if that's what Apple actually does. If it is, once it gets popular enough as an anti-bot measure there may be farms of Apple devices selling these tokens. It's a separate system from remote attestation anyhow.