[Aerroon]

It's this thing that's at fault: https://digital-strategy.ec.europa.eu/en/policies/revision-a...

Google even says so: https://support.google.com/youtube/answer/10070779?hl=en

>The Audiovisual Media Services Directive (AVMSD) is an EU-wide coordination of national legislation on audiovisual media – both traditional TV broadcasts and on-demand services. Recently, AVMSD was revised to extend certain rules to video sharing platforms (VSPs).

>In line with AVMSD, you may be asked to re-verify your date of birth when watching age-restricted videos. Follow the prompts to submit an image of a valid ID or credit card.