Earlier quoted context omitted.
If it’s not anonymous then it’s only a matter of time until it’ll lose its privacy …
They have sealed sender which improves contact privacy.
https://signal.org/blog/sealed-sender/ says "By design, it does not store a record of your contacts, social graph, conversation list, location, user avatar, user profile name, group memberships, group titles, or group avatars."
However, today the reality is that signal collects your name, photo/avatar, and your contacts and stores it forever in the cloud.
see:
https://web.archive.org/web/20250117232443/https://www.vice....
https://web.archive.org/web/20230519120156/https://community...