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: <a href="https://conferences.sigcomm.org/hotnets/2022/papers/hotnets22_schmitt.pdf" rel="nofollow">https://conferences.sigcomm.org/hotnets/2022/papers/hotnets2...
barathr · · focus · HN ↗
We wrote a research paper on the general principle a few years ago: <a href="https://conferences.sigcomm.org/hotnets/2022/papers/hotnets22_schmitt.pdf" rel="nofollow">https://conferences.sigcomm.org/hotnets/2022/papers/hotnets2...
dongcarl · · focus · HN ↗
I didn't realize Chris Wood was also an author!