I’m usually in the camp that people should just speak as they like, but using they is just a really natural thing and non invasive in the English language. That’s a change that makes sense. They in this position might also refer to an organization, it Abstracts the entity using the thing away, which makes sense.
If the governments would get their shit together, we could have something like age assertion with the eid chips in our IDs. Imagine that. The important thing is that website.com just asks the government “is this user an adult?” And the government replies “yes”. No information besides the relevant one is provided, and it’s through a trusted authority.
Yeah, not gonna happen, just like using the keys in my Personalausweis to send encrypted mail.