Technology

In all likelihood, they do not. The politicians are pandering to a certain holier-than-thou-always-in-your-business group with no regard to the consequences. Kids have always been good with technology, and the Internet is a big place. So, it doesn't stop their access. Hell, some of the teens dm nude selfies to each other. Which creates a new set of problems with how they can caught in the CP/CSAM laws, but I digress.

This opens a whole host of problems:

1. There's sites collecting and holding on to that data. I'm sure they'll never get hacked or the data will never get stolen by an insider.
2. Phishing sites will pop up. Yes, please enter your driver's license, social, or credit card number to this totally legitimate site.
3. There's sites taking that information and associating it with an advertising profile. They shouldn't be allowed to do that, but putting a real name to a profile is just gold. I could see less savory sites doing this.
4. They may also auto-bill people if they used a credit card for verification. Again it's not allowed, but less savory actors and all that.
5. Finally, there's the cost and potential liability to the sites themselves.

But that holier-than-thou group sees all these as features and not bugs.