I was wondering when I would see this headline. I wonder if any other big names do similar

I also wonder whether or not grapheneos, or open source Linux OSs in general, will face any repercussions for failing to comply to these regulations due to the relatively low user count.

Hate to say it but systemd, the init system of most Linux distros, already has PRs with maintainer backing to implement DoB recording.

Some people can’t kneel fast enough.

That’s just systemd adding a birthdate field to their userdb. Doesn’t require that it be filled out or accurate, and especially doesn’t require it to be validated against a government database. I don’t see it as fundamentally any different from adding a userdb field for favorite color, phone number, or blood type.

Without 3rd party validation, I really don’t see the privacy issue with an age field. Without verification, it is, at worst, one more byte available to hash into a unique identifier, but you can feed that field from /dev/random at every query and poison even that hypothetical.