There is absolutely no need for new technology to track people, it's there already.
Also I feel like a big reason for age verification is social media. Many countries are trying to prevent kids from accessing social media (because we know it's bad for them), and age verification is the way to do that.
Badly implemented, age verification is bad. But there are ways to implement it in a privacy-preserving manner, which wouldn't make the current state of surveillance capitalism worse.
But the current push from all sides to provide id for everything and remote attestation through Google and apple will make the alternatives very hard to use as it basically cuts such people from the economy altogether.
And corporations are having issues discerning bots from people without making access to their services a fuss or dependent on possibly idealistic and troublesome open source projects, like Anubis.
It's truly, absolutely, not about "age verification". If it were about protecting kids from harm they'd take money from corporations post factum that are offending. Instead they're preparing to spend a lot of money. You could also look at who is heavily lobbying for this, you'll find it is fascist tech oligarchs from the US. They couldn't care less about kids except for obscene or profitable purposes. It would be weird for them to be cosy with epsteinian networks of power and at the same time be mindful about the wellbeing of children.
You vastly underestimate the current state of surveillance capitalism.
> You could also look at who is heavily lobbying for this, you'll find it is fascist tech oligarchs from the US.
Go in the street, and ask a bunch of random people: "If there was a way to prevent kids from accessing stuff that is bad for them, and it had no downsides. Would you want it?". I'm absolutely certain that not only fascists will say they would want it.