For those interested on the question of age verification and GNU/Linux: be aware that Systemd v261-rc1 was recently released. It now implements an optional birth date field in the JSON user database (see second item under “Other changes”).
The implementation of this field was prompted by age-verification or -attestation laws.
Miss me with this “slippery slope” BS.
Having a standardized place to store the DOB is a good thing and it should have been there even before these laws.
And if some users want to comply with those laws, then they should have a way to do it.
If anybody actually tries to make this a hard requirement (which isn’t going to happen), then you can bitch about it at that time.