> How do you imagine
that will be enforced? Perhaps by... ID?
Emphasis mine. It's that that which I'm disputing.
This law does not require you to have an account to go onto a website. It is a law that requires you are age-checked to hold an account on social media platforms. These are different things.
Holding an account —broadly speaking— allows you to post, like, comment, follow and be profiled in an enduring fashion. Some of these can have life-long implications that 12 year olds aren't equipped to evaluate. How many adults can identify unhealthy social media usage and do something to stop it?
I don't know how age verification will work in practice. Checking a government ID is one way but if you're handing that off to a third party service, it's expensive. They don't need to know who you are for certain. A similar check is when you buy alcohol. If you look young, you're asked for ID.
When I buy alcohol, I'm not because I look like a man with kids nearing his forties. It would be far cheaper for Facebook to have an AI watch a video of you speaking to camera, with ID as a fallback. Many social media platforms are ingesting gigabytes of our faces every day so. They probably already know the rough ages of their users.
But going on a website (eg Youtube) doesn't require you have a profile. Going on Facebook business pages doesn't require it. If anything, laws like this might mean that things like Instagram have to be more open to preserve their reach. Not a bad outcome, IMO.