This makes the mistake of confusing systemd the service manager and systemd the project. This is an easy mistake to make given they have the same name.

The systemd service manager does not have an installer, systemd-sysinstall is a separate tool that's part of the systemd project.

> systemd already integrated it, why (age verification)

systemd has not integrated age verification. All that's been discussed is a simple field to allow a user to register a DoB and an way for services to validate the user is over a certain age.

You could arguably already do this by having a DoB field for the user, but that'd involve giving applications your full DoB which I'm sure is distasteful for many.

> usual "fight" against non-sense laws

Because developers have to follow laws like everyone else?