As others have pointed out, this is like Apple iCloud Private Relay, and other multi-hop privacy systems that have been built on and off over the last several decades (Tor included).

We wrote a research paper on the general principle a few years ago: https://conferences.sigcomm.org/hotnets/2022/papers/hotnets2...

Discussed (just a bit) at the time:

The Decoupling Principle: A Practical Privacy Framework [pdf] - https://news.ycombinator.com/item?id=33897450 - Dec 2022 (3 comments)

Perhaps we should arrange a new thread about this?

Good to see you here Barath :-)

I didn't realize Chris Wood was also an author!