itsjpb I appreciate the link to the grapheneos.org privacy policy. It is nice to know that the grapheneos.org team has adopted the EFF's DNT policy, in particular that the GrapheneOS web servers delete log data after 10 days.
Since discuss.grapheneos.org sends mail when a thread is updated, it is retaining some user identification (the mail address) indefinitely rather than for 10 days. But users are providing that information voluntarily with the expectation that it will be retained and used that way, so that's fine.
With your help I think I understand what the other poster meant by:
Paflechien grapheneos has the user ids that it keeps for 10 days
Thanks!