Beyond the problems of algorithmic age verification, the idea of using government-issued ID itself faces insurmountable problems. There's a significant demographic here in the UK with precisely zero government issued ID (older, poorer, more disabled), which is currently causing significant problems for the Tories and baby's-first-voter-suppression act (I predict chaos at the local elections in May). As the only government issued forms of ID are passports and drivers licenses, and plenty of people have neither, often due to protected characteristics like disability, it's leading to ridiculous proposals such as OAPs being able to use local council issued concessionary bus passes as voter ID, but not younger people with the exact same piece of paper.

And I'm curious as to how DW, or Facebook for that matter, would be able to tell if government ID from, say, Vanuatu, was legitimate?