An init system does not need to know my personal details; it’s for starting programs in a specific order just fuck off with this shit. You don’t even have to capitulate to this stuff and these freaks are out here doing it preemptively like they expect a fucking pat on the head for being first in line to dive tongue first on to that boot.

What service should handle it instead?

Why is it need at all??

NONE

Because it’s going to be a legal requirement, with fines of $7000 per affected underage user, which will instantly bankrupt the US-based non-profit representing Debian, Arch and others, and kill off community-maintained Linux.
Do note: The legal requirement is NOT for age verification. Only for having a field where you as the admin can enter whatever the fuck you want.

If you don’t agree with the law, good. Neither do I. But the devs aren’t the ones to apply pressure to, here.
They’re forced to do this to keep the lights on, and they’ve implemented it in a way that keeps you as the admin in full control.