Need is a very strong word. I'd call it a desire. Currently you can often identify people, sure, but there's hassle involved. What they want to do is to plug in a private corporation separate from whatever service that is likely to be more loyal with the state apparatus than the service, or else it is easily switched out for another.

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.