Comment by nvme0n1p1

If you care about privacy, the user struct has had a real_name field since (at least) 2020: https://github.com/dylanmtaylor/systemd/blob/7a858878a03966d...

Do you feel like systemd has been collecting your PII since 2020? If so, you have only yourself to blame, since it only stores what the user types in and nothing more. Birth date is exactly the same. Type some nonsense in that field if you like, or leave it blank.