the user 
 is connecting from. The selection of Relay IP addresses is influenced by the user’s original IP address and IP Address Location setting preferenc...

https://www.apple.com/jp/privacy/docs/iCloud_Private_Relay_Overview_Dec2021.PDF

, helping to assure the privacy of the shared information. In order to stay within the privacy budget we do not send the entire sketch matrix to the server ...

https://www.apple.com/jp/privacy/docs/Differential_Privacy_Overview.pdf