@sarah @cmconseils may I remind you, that you already for about 12 years had fields for your real name, surname and exact location? Which were, same as this new DoB field, empty by default and 100% optional.
It's like you said "I feel unpleasant that this restaurant added green tea to their menu, even though I'll never order it, and nobody will force me to order it"
@sarah your "clone meat" is prime level bullshit.
SystemD has userDB. I encourage you to go through it.
This db has multiple optional fields, that are empty by default, and nobody is forcing you to fill them. Such as name, surname, location. Systemd doesn't prevent you from using your OS if you don't give it your name or location. And now they added a new optional field - date of birth. Want to fill it? Do it. Don't want? Don't do it. Or lie about your DoB. Who cares? Not systemd.