Wow, that xkcd really scares me. I Have No Mouth, and I Must Scream.
It's definitely something that could realistically happen in the near future, maybe even mandated by the EU
But serious discussion demands the truth: It is fiction, in the style of a twitter thread.
That's why I think it's funny that they claim they will now be "using AI" to determine if someone is an adult and able to watch certain youtube videos. Google already knows how old you are. It doesn't need a new technique to figure out that you're 11 years old or 39 years old. They're literally just pretending to not know this information.