it's just the lack of a policy on user data collection that the users can read, the chance to ask to get their data removed from the training data - gdpr - and an age verification for the users.
Do you need to verify your age to perform a Google search?
I think "age verification" is just another "think of the children" ploy to force all websites to check their users' government IDs (starting with sites run by people whose politics are different from those of the government that's enacting the ploy).
I personally don't know if you can be exposed to information not suited to underage kids in chatgpt (which was the reasoning of the regulator), and in general am not a huge fan of putting rules in place because it's the internet...you can always work around blocks, but at least in google you have safesearch which hides some content before the kid becomes too smart to find it anyway.
